Windows 7 Upgrade Advisor lets you know if your PC is Win7 ready

But if you want a second opinion, Microsoft has released a beta version of the Windows 7 Upgrade Advisor. This is a utility that you can run on your Windows XP or Vista machine to determine whether your system is ready for Windows 7. Basically, it checks your computer's memory, processor, storage, and graphics hardware. It will also check for known software compatibility problems.
If your PC passes the test, the Advisor will tell you. If not, it will attempt to provide steps you can take to get your computer ready for Windows 7.
You'll want to make sure any USB devices you regularly use such as a mouse, printer, external hard drive, or scanner are plugged in when you run the utility.
[via Windows Experience Blog]
