just added features/tools, added layer support etc...just things advanced users would use anyways. 5.5 comes with Image Ready, thats what I use to optimize for web and animated gifs...you may be able to find a PS 5.5 "classroom in a book" by Adobe Press' at the library, good book for learning 5.5. PM me an addy I can send it too, and what he said, dont register it...