.htaccess

I've posted about this before, but now I’m all set with my host to make it happen.
I want to change the link structure on my site from...

http://www.site.com/home.php?username=jsmith&date=1092812400
To
http://www.site.com/home/jsmith/1092812400

I've been reading over this site tonight..
http://httpd.apache.org/docs/misc/rewriteguide.html

I've become more confused now then ever, my question is, what do I need to edit or add to the .htaccess file to create those new formed links?
And can I have my new links work like this...

http://www.site.com/video/jsmith/1092812400 and http://www.site.com/pics/jsmith/1092812400


I appreciate all your help.