As a casual user, V2007, meets all of my needs. Doesn't seem like it was that long ago that I finally upgraded from V2003. I guess, when I upgrade to 64Bit O/S, then I'll upgrade Visio -- after all of you energetic folks work out the bugs!!!

...now where did I put that windup crank for my 386???
UPDATE 2/4/2012:
Have V2010 at work...Can I change my vote to NEVER!!! It's that blasted ribbon.
A.) It actually occuppies more screen space

B.) It is BADLY organized -- so, it's difficult to find things.

C.) There are fewer commands immediately available; this requires more steps to do something simple. Although, thanks to Chris' book

, I discovered the quick command section where I can put my "favorite, frequently used" commands Gee, I feel like I'm having to convert the ribbon back to pre-ribbon days to make it useful. What's the point???

It is so overwhelmingly bad, that it overshadows any pluses the release may contain.