Just a note to be careful when looking for the latest Windows 8 adverts folks. Seems some companies not surprisingly, want to take advantage. pchelpsoft.com for example, who are using this (appeared on windows8beta.com);
And Babylon, who are using this (also appeared on windows8beta.com);
If you're looking for Windows 8, then either use the following, or for those of you with Technet/MSDN subscriptions, you should find it in Technet/MSDN.
You'll find the Beta download for Windows 8 Server here (just found this myself, didn't know there was one);
Little extra clarification by the way - windows8beta.com is NOT a Microsoft site, nor is it endorsed or supported by Microsoft.