Can I chime in also?
I've got 2007 on 2 systems, but I use 2003 mostly - even to the point of
either remoting to a 3rd system that still has 2003 on it, or using a virtual
machine on this one with 2003 on it (also virtual machines on it with Office
2000 and Office XP).
So far 99.999% of the questions I see on this board have solutions that are
not Excel 2007 unique, and I end up working out/testing solutions under a
pre-2007 version of Excel anyhow, just to make sure they DO work there. In
fact, probably 95% of the questions could be answered with solutions that
would work at least as far back as Office/Excel 95 (except probably for row
limitations).
Quite frankly, if I didn't have an MSDN subscription, or hadn't been given
an Office 2007 Pro key at a recent Microsoft 'launch' event, I would not have
gone out and bought it at this point in time. Heck, I've got umpteen
licenses for Vista (MSDN and Action Pack + 1 free upgrade via a system I
purchased in December) and I haven't got that loaded on any systems yet.