Yeah, I broke down and got the Vista Start Menu. I like it, although it means when I'm confronted by a W7 system without it, it'll be more difficult to find things in the start menu because I'll be less familiar with it... BUT, improved productivity mandates that I use it for my primary machine...
So far I think Windows 7 works ok, but to a large extent I don't see people jumping on the bandwagon to upgrade from XP. As a photographer, and member of a couple photography clubs, I've asked people whether or not they plan to move. In most cases the answer was "no" because "XP works extremely well", "MS has priced W7 Pro at a ridiculously high price", and in some cases because "they weren't impressed with the silliness and eye candy of Vista when they've seen it".
In some cases they're likely not to change because mfr's of hardware or software they're using have chosen not to support Windows 7. Dell, for example, appears to have no drivers for their 2405fpw or 2407fpw monitors, which many photographers use. Without good drivers, the calibration tools may not work - specifically the Spyder 2, which again many photographers use, has problems calibrating the monitors...
Another problem I've heard is that the machines won't run W7. I tried the beta on my laptop, which is 3 years old, and works perfectly for managing images when on the road, didn't work well with W7. There weren't any drivers so my video would work correctly, and since it only has 2GB of memory W7 was problematic. So, that machine as well as the two other desktops I run at home will likely stay on XP.
So even though XP is ancient, I have a feeling that a lot of the people I know won't be changing any time soon. Of course, these are like me, old fuddys.