Did you do an upgrade or a clean install?
isnt this the case with every new op from microsoft ?
i remember vista coming out and waited 6 month's before i swapped over from xp and everything was fine after the release to which there was many problems with vista.
i learnt my lesson with vista and will wait till windows 7 has been fixed and there are plenty of drivers about so everything ive got work's.
Have you actually looked to see if your drivers wont work in Windows 7?
As has been said already a lot of drivers for Vista will work on Windows 7, and Windows 7 itself has massive driver support out of the box.
I have installed Windows 7 four times recently on different hardware and the only driver installation I had to do myself was for my graphics.