Microsoft released Windows 7 Compatibility Center- Check hardware and software for compatibility with Windows 7
Of course you can use a free tool from Microsoft called Windows 7 Upgrade Advisor that will let you know the compatibility issues with your programs and devices after scanning your Windows XP or Vista system. But it will not help users who plan to buy a new computer.
Here comes the importance of Windows 7 compatibility Center- an online service from Microsoft that can check hardware and software for compatibility with Windows 7.
Here you can check any software or hardware using a simple web form. For example, just enter a search term (e.g. Firefox) in the search field under software to know whether it is compatible with Windows 7 or not.
You can also browse software or hardware by category, Microsoft will show you the most popular software or hardware that is compatible with Windows 7.