"In this free course, Todd Kopriva, co-author of Adobe After Effects CS5 Learn by Video, helps you avoid common After Effects hiccups with a collection of answers to Frequently Asked Questions. Whether you´re having audio hiccups, getting pixelated vector graphics, or getting oversized files or jerky playback, Todd equips you to zip past these common hurdles and get back to creating great effects."
If you're having performance issues in CS5, that FAQ is a good place to start looking for help.
This series is a prelude to a Video2Brain course by Todd and Angie Taylor due in November, After Effects CS5 Learn By Video, a book with video on AE fundamentals.
Update: the real Clippy was spotted at Conigs.