MSDN - 12/1/05
MSDN subscribers can download the WinFS Beta 1 Refresh and Documentation. See MSDN Building WinFS Solutions for additional information.

The WinFS Beta 1 Refresh contains the same functionality of the Beta 1 release and runs on the final release of the .NET Framework 2.0

WinFS Beta 1 Refresh (English) English 2005-12-01
WinFS Beta1 Refresh Documentation (English) English 2005-11-30

Before installing the WinFS Beta 1 Refresh, you must uninstall your previous WinFS install along with any Beta releases of Microsoft Visual Studio and the .NET Framework 2.0. There’s also a handy tool  that uninstalls all the VS products for you.