We just made Internet Explorer 8 Beta 1 available. This could be important if you are developing web applications or just if you are curious! :-)

http://www.microsoft.com/windows/products/winfamily/ie/ie8/readiness/Install.htm

See also:
http://channel9.msdn.com/showpost.aspx?postid=388331
http://www.on10.net/blogs/larry/First-Look-Internet-Explorer-8/ 

Urs