Internet Explorer 8 from Microsoft Website (IE 8 Beta 1)

Download the beta release of Internet Explorer...
For XP:

http://www.microsoft.com/downloads/details.aspx?FamilyId=1A2E3DDD-B38B-439D-BBA7-F179A5D3ECAF&displaylang=en


For Vista:

http://www.microsoft.com/downloads/details.aspx?FamilyId=C3C6E8C1-BD91-490B-86F5-F3652DD691DE&displaylang=en