QGIS 0.7.3 doesn't let me use these views; apparently it requires some sort of unique key per row. The full error text it throws is below.

Here's some info on QGIS and views with suggested workarounds. Note they say "not necessary for versions 0.7 and later". My guess is QGIS finding the geometry just fine but can't find a unique ID. I tried various ways of hacking around this without much luck, but I'm a bit out of my depth here. I didn't try the OID suggestion in the linked page because my source OSM table was created without OIDs.

I don't really need High Road to work with QGIS, I was just playing around. Just filing this issue to document it.

The view 'public.planet_osm_line_z10' has no column suitable for use as a unique key.
Quantum GIS requires that the view has a column that can be used as a unique key. Such a column should be derived from a table column of type int4 and be a primary key, have a unique constraint on it, or be a PostgreSQL oid column. To improve performance the column should also be indexed.
The view you selected has the following columns, none of which satisfy the above conditions:
'access' derives from 'public.planet_osm_line.access' and is not suitable (type is text) and does not have a suitable constraint)
'addr:housenumber' derives from 'public.planet_osm_line.addr:housenumber' and is not suitable (type is text) and does not have a suitable constraint)
'addr:interpolation' derives from 'public.planet_osm_line.addr:interpolation' and is not suitable (type is text) and does not have a suitable constraint)
'admin_level' derives from 'public.planet_osm_line.admin_level' and is not suitable (type is text) and does not have a suitable constraint)
'aerialway' derives from 'public.planet_osm_line.aerialway' and is not suitable (type is text) and does not have a suitable constraint)
'aeroway' derives from 'public.planet_osm_line.aeroway' and is not suitable (type is text) and does not have a suitable constraint)
'amenity' derives from 'public.planet_osm_line.amenity' and is not suitable (type is text) and does not have a suitable constraint)
'area' derives from 'public.planet_osm_line.area' and is not suitable (type is text) and does not have a suitable constraint)
'barrier' derives from 'public.planet_osm_line.barrier' and is not suitable (type is text) and does not have a suitable constraint)
'bicycle' derives from 'public.planet_osm_line.bicycle' and is not suitable (type is text) and does not have a suitable constraint)
'boundary' derives from 'public.planet_osm_line.boundary' and is not suitable (type is text) and does not have a suitable constraint)
'bridge' derives from 'public.planet_osm_line.bridge' and is not suitable (type is text) and does not have a suitable constraint)
'building' derives from 'public.planet_osm_line.building' and is not suitable (type is text) and does not have a suitable constraint)
'construction' derives from 'public.planet_osm_line.construction' and is not suitable (type is text) and does not have a suitable constraint)
'cutting' derives from 'public.planet_osm_line.cutting' and is not suitable (type is text) and does not have a suitable constraint)
'disused' derives from 'public.planet_osm_line.disused' and is not suitable (type is text) and does not have a suitable constraint)
'embankment' derives from 'public.planet_osm_line.embankment' and is not suitable (type is text) and does not have a suitable constraint)
'foot' derives from 'public.planet_osm_line.foot' and is not suitable (type is text) and does not have a suitable constraint)
'highway' derives from 'public.planet_osm_line.highway' and is not suitable (type is text) and does not have a suitable constraint)
'historic' derives from 'public.planet_osm_line.historic' and is not suitable (type is text) and does not have a suitable constraint)
'horse' derives from 'public.planet_osm_line.horse' and is not suitable (type is text) and does not have a suitable constraint)
'junction' derives from 'public.planet_osm_line.junction' and is not suitable (type is text) and does not have a suitable constraint)
'landuse' derives from 'public.planet_osm_line.landuse' and is not suitable (type is text) and does not have a suitable constraint)
'layer' derives from 'public.planet_osm_line.layer' and is not suitable (type is text) and does not have a suitable constraint)
'leisure' derives from 'public.planet_osm_line.leisure' and is not suitable (type is text) and does not have a suitable constraint)
'lock' derives from 'public.planet_osm_line.lock' and is not suitable (type is text) and does not have a suitable constraint)
'man_made' derives from 'public.planet_osm_line.man_made' and is not suitable (type is text) and does not have a suitable constraint)
'military' derives from 'public.planet_osm_line.military' and is not suitable (type is text) and does not have a suitable constraint)
'motorcar' derives from 'public.planet_osm_line.motorcar' and is not suitable (type is text) and does not have a suitable constraint)
'name' derives from 'public.planet_osm_line.name' and is not suitable (type is text) and does not have a suitable constraint)
'natural' derives from 'public.planet_osm_line.natural' and is not suitable (type is text) and does not have a suitable constraint)
'oneway' derives from 'public.planet_osm_line.oneway' and is not suitable (type is text) and does not have a suitable constraint)
'operator' derives from 'public.planet_osm_line.operator' and is not suitable (type is text) and does not have a suitable constraint)
'osm_id' derives from 'public.planet_osm_line.osm_id' and is not suitable (type is int4) and does not have a suitable constraint)
'place' derives from 'public.planet_osm_line.place' and is not suitable (type is text) and does not have a suitable constraint)
'power' derives from 'public.planet_osm_line.power' and is not suitable (type is text) and does not have a suitable constraint)
'power_source' derives from 'public.planet_osm_line.power_source' and is not suitable (type is text) and does not have a suitable constraint)
'railway' derives from 'public.planet_osm_line.railway' and is not suitable (type is text) and does not have a suitable constraint)
'ref' derives from 'public.planet_osm_line.ref' and is not suitable (type is text) and does not have a suitable constraint)
'religion' derives from 'public.planet_osm_line.religion' and is not suitable (type is text) and does not have a suitable constraint)
'route' derives from 'public.planet_osm_line.route' and is not suitable (type is text) and does not have a suitable constraint)
'service' derives from 'public.planet_osm_line.service' and is not suitable (type is text) and does not have a suitable constraint)
'shop' derives from 'public.planet_osm_line.shop' and is not suitable (type is text) and does not have a suitable constraint)
'sport' derives from 'public.planet_osm_line.sport' and is not suitable (type is text) and does not have a suitable constraint)
'tourism' derives from 'public.planet_osm_line.tourism' and is not suitable (type is text) and does not have a suitable constraint)
'tracktype' derives from 'public.planet_osm_line.tracktype' and is not suitable (type is text) and does not have a suitable constraint)
'tunnel' derives from 'public.planet_osm_line.tunnel' and is not suitable (type is text) and does not have a suitable constraint)
'waterway' derives from 'public.planet_osm_line.waterway' and is not suitable (type is text) and does not have a suitable constraint)
'way' derives from 'public.planet_osm_line.way' and is not suitable (type is geometry) and does not have a suitable constraint)
'way_area' derives from 'public.planet_osm_line.way_area' and is not suitable (type is float4) and does not have a suitable constraint)
'width' derives from 'public.planet_osm_line.width' and is not suitable (type is text) and does not have a suitable constraint)
'wood' derives from 'public.planet_osm_line.wood' and is not suitable (type is text) and does not have a suitable constraint)
'z_order' derives from 'public.planet_osm_line.z_order' and is not suitable (type is int4) and does not have a suitable constraint)