IE 8 Beta 1 - Successfully installed on test PC at home
This new beta version should be installed on a test PC only. I've encountered a couple websites that don't support IE 8. I installed it mainly to learn the new interface and explore the new security features. Most things are working well in early tests 
Internet Explorer 8 Tech Beta 1 - Good List of Resources
http://aumha.net/viewtopic.php?t=32255