Microsoft have launched the compatibility centre for Windows 7. A website simply containing a database of software and hardware that is known to work fine with their new operating system.
The database is by no means exhaustive. The first software package I searched for, Microsoft’s own Photodraw v2.0 failed to appear in the database even though I know it works fine in Windows 7. The website does give you the opportunity though to add additional hardware and software yourself if you know it to work, which is a nice touch.
With hardware you’re always better first visiting the manufacturer’s website and downloading any Windows 7 drivers, at the same time checking whether those drivers will support both 64 bit and 32 bit versions of Windows 7.
For seeing if some of your older software will work though, this is a useful tool when you’re considering upgrading.