I have got the latest CVS release of LLVM. And built the Win32 MS VC++ 2003 port with modifications for MS VC++ 2005.
Do bear in mind the Visual Studio ports are by no means complete, and are on going.
Microsoft Visual Studio 2005 Beta (codename Whidbey) can be got from Microsoft Beta program nearly for free; the cost of postage from :-
http://lab.msdn.microsoft.com/vs2005/get/order/default.aspx
Custom Build Steps
llvm-vs2005.tar.gz (23 KB)