Our good pal Jeff Beehler wrote a good post announcing Beta1 downloads being available.  Want to see what we've been working on for the last year?  Try out the Beta!  We want your comments and bugs so the final release is something you'll be very happy with. 

http://blogs.msdn.com/jeffbe/archive/2007/05/03/all-orcas-beta1-downloads-now-available.aspx