Bigshot Media
Sells looping flash animations/movies that you can use in your projects. Sweet idea!

SoundRangers.com
A great resource for all kinds of sound effects for your Flash files.

Pesky Bitmap Imagery Got You Down? (Thanks to WireTree.com)
By following a couple simple steps when authoring in Flash you can avoid the ripple effect that is sometimes caused when you pass a vector element over a bitmap image.