I've been enjoying playing with Edge Animate. Not that I can make anything pretty with it, but if you need an animation of a square that moves to the left, I AM YOUR GUY! I like hacking additional functionality into Edge Animate projects and those blog entries end up being pretty popular. (In fact, I've got yet another follow-up to my "show when visible" series.)
This weekend I got an email from Rob Boerman. He has a site called Edge Hero that you might want to check out. He has a library of useful interactions and widgets you can add to your project.