We'll be headlining this on the Security Developer Center later this week.It's a pretty important step for Web Services as Matt notes in his blog.

Discover how two parties using Web services can interoperate in a Kerberos environment. Covers securing SOAP messages, including the security tokens, how signatures look on the wire, and how to obtain tokens in this environment. [MSDN Just Published]

Update: I'll try to get that headlined this week. Most of the staff was on vacation last week.