Microsoft is finally open sourcing WTL (Windows Template Library) at SourceForge.net.  WTL is popular among Win32 C++ programmers for building lightweight applications and extensions such as IE plugins or ActiveX, but it was never supported officially and managed to limp ahead through individual efforts of the ATL team members.

The version in the CVS seems to be an alpha 7.5.  If you need a stable version, download version 7.1 from Microsoft.