Photoshop 5.5 vs. 6.0

I have some tutorials that were done in 5.5, I have 6.0 and some of the commands or instructions don't work. Is there a list of what things were changed between the versions and how to access them in 6.0?

have you tried the index in the v6 manual? or f1? there's also usually a section in each manual at the start called "what's new".