Coming from PS 7 it is all new to me except those things that are also in After Effects. AF has had the Puppet Tools for a few versions already. But that is expected being it's a compositor.

   I personally enjoy using the Clone Brush in PS CS5 because it has a preview everywhere you move the cursor and I can tell if it will match the area that I am using it on before I apply it. I am not sure if that is New to PS CS5, but it is certainly New to me.

   I am sure when I gt into the HDR and 3D parts of CS5 that is going to be interesting as well.

I would rather be Politically Incorrect,
Then have Politically Correct-Incorrectness!!!