CastleMouse 2000 is a fun puzzle game. There's a free (yeah, Shockwave :) version on Shockwave.com.

I've always thought The Powerpuff Girls would make a great video game. It looks like they would also make a crappy one. (PPG looks like it was drawn in Flash to begin with, so this otherwise seems appropriate.)

I like Disney.com's 404 error page. :)

Shockwave.com has Atari classics in playable Shockwave form! Quite accurate renditions, too. Centipede, Frogger, Missle Command, and Super Breakout. (Sorry I can't link directly, you'll have to look for it...)

More twisted Shockwave animations. Some of these have interactive portions.

Hmm... Should I get Flash now ($99 acad), or save up for Director ($249 acad) months down the line? Flash would be fun for animations, but I'm more interested in being able to make interactive tutorials (and maybe games). [Update: My mistake, Director is $370 acad. Not really an option. Am I missing out?]