Will try to use VS 2010 Sequence Diagrams to build some customer docs, so this links are handy:

 http://weblogs.asp.net/gunnarpeipman/archive/2009/11/20/visual-studio-2010-generating-sequence-diagrams-on-the-fly.aspx

http://blogs.u2u.be/peter/post/2009/10/21/Generate-sequence-diagrams-with-Visual-studio-2010.aspx

http://blogs.msdn.com/habibh/archive/2009/07/29/use-uml-sequence-diagrams-in-team-system-2010-to-reverse-engineer-your-code.aspx

http://msdn.microsoft.com/en-us/library/dd409389(VS.100).aspx