Microsoft has made the upgrade version of the next version of Windows, Windows 7, available for pre-order at a reduced price. The response has been terrific - Microsoft Windows 7 Home Premium Upgrade is now the #1-selling software item on Amazon. During the promotional period it is available for only $49. The Windows 7 upgrade advisor from Microsoft is a free download which can tell you if your PC has what it takes to run Windows 7.

Update: the promotional price has expired.