I fixed PHP warning on custom-post-donations.php

On line 188 of custom-post-donations.php

You have:
return createCPDonationForm($atts[id]);

when it should be:
return createCPDonationForm($atts['id']);

Doing so removes the following warning:
Notice: Use of undefined constant id – assumed ‘id’ in /var/www/dev.nickpowers.info/html/wp-content/plugins/custom-post-donations/custom-post-donations.php on line 188

You might think about making this change in the next update.

http://wordpress.org/extend/plugins/custom-post-donations/