Here are the links for the online feedback forms:
Convention feedback (this is identical to the form in your registration packet, so you don't need to fill them both out):
http://us.pycon.org/apps/surveys/feedback2006/
Talk feedback -- you can fill this out multiple times to provide feedback for several different talks.
http://us.pycon.org/apps/survey/talks2006/
If you attended a tutorial, you can provide feedback comments about the session at this address:
http://us.pycon.org/apps/surveys/tutorials2006/
The survey application was written by Doug Napoleone.
--amk