Don't worry, Access 2007 is so similar to previous versions that it's a bit of an anti-climax! They do just tend to move stuff around on the menus, which is a pain. Apart from that, and the Help system being totally, completely, madly useless, not much change.
By the way, if you have a good textbook on Access 97, don't pay out for the new "Bible", called "Access 2007 Inside Out". It is truly horrible and hasn't even got a decent index. I've answered all my VBA problems using my old 97 Macro and VBA Handbook. Could have saved 50 dollars.