A news from Paul Thurrot says that maybe on late July we'll see the release of Longhorn Beta 1, what seems to be the most stable Beta 1 OS releases in Microsoft history (will be true? 
). We'll have Beta 2 scheduled for November.
We'll have a summer to play with Longhorn? I've to prepare my Virtual Server (although I know that will be difficult to run Longhorn at the full capabilities under a virtual machine). Stay tuned... 