Although yes Win7 specific drivers are ideal, in most cases, as long as drivers are Vista optimised (ie, not those early patched-up XP drivers) you should be fine. Win7 isn't making the huge break-away that was done with Vista (more evolution than revolution).The reports I am hearing across the boards is that ppl are actually managing to run Win7 on hardware/systems which crumpled under Vista.
As to drivers, compile them prior to installing Win7 (cd, thumb-drive... doesn't matter). DON"T install drivers at Win7 install. That option is ideal ONLY if you know every driver is compatible. In your case, ou might find a couple of different driver versions in some cases and have to experiment a little. Sounds like more work, but done once you can delete those which are useless and there is your base set of drivers all ready for when Win7 hits the deck in full release... this is after all a pre-release, and is designed to give ppl the chance to fiddle and figure out what works best for them.
If you dual boot, or set up as a "virtual" install, you can play with it without losing your original OS install