I am doing quite a bit with the WSE 2.0 Tech Preview lately, specifically around WS-Policy and WS-Security Kerberos Binding.  I am also giving a lot of presentations surrounding these specs (hopefully I will get the time to post some code samples soon). 

Giving these presentations, people frequently ask “when was this spec released”?  Early Adopter points to a WSA Timeline

Gonna make this one into a PowerPoint slide today.