Bart De Smet yesterday shared some Longhorn milestone dates, for anyone who's keeping track. RTM of the client on 24 May 2006, apparently. Personally I found it more interesting to hear that WinFS might be backported to Windows XP (which, let's face it, will be around on desktops for very many years to come).

http://blogs.bartdesmet.net/bart/archive/2005/03/07/678.aspx

http://www.microsoft-watch.com/article2/0,1995,1772619,00.asp

http://slashdot.org/articles/05/03/07/1442256.shtml?tid=109&tid=198&tid=201&tid=1