Jeff Levinson's has followed up his last column on the April 2008 VSTS CTP with a new one called The Joy of Sequence Diagrams.

In this article Jeff reviews the Logical Class Diagram and the Sequence Diagram.

My favorite bit:

The benefit of the revamped diagrams is that not only can the represented information be semantic, but it can also be non-semantic. That is, it can be used to communicate ideas and thoughts without adding any particular constraints to a solution. This makes the new suite of diagrams in the Architecture Edition particularly powerful and useful.

Hopefully Jeff will cover more in his upcoming articles.