Comment Free VPC images of XP and Vista (Score 1) 189
Microsoft is letting you download virtual PC images of XP SP2, SP3 and Vista (presumably SP1) with IE6, IE7 and IE8 RC1 free of charge. It's called "Internet Explorer Application Compatibility VPC Image".
They have a set expiry date, but at this time you should be able to download updated version.
http://www.microsoft.com/Downloads/details.aspx?FamilyID=21eabb90-958f-4b64-b5f1-73d0a413c8ef&displaylang=en