The wait for WinXP RC 2 is over
WinInsider | at | by Mike
I have just started download of WinXP RC 2 from MSDN, also Windows Beta Testers are able to download RC2. Moreover, people that have registered for Windows Preview Program will be able to get long awaited WinXP. So if you are able to get WinXP, then start your modems, it is about 450MB.
More info can be found in the comments.