I'm speaking with both the Boston .NET and the Beantown .NET user groups this week, both on XNA! It's basically the same content as our first meeting (basics of XNA and 2D games), but I'm mentioning it here in case you either missed that meeting or know of others who would like to get up to speed so they can join our regular group meetings.
Everyone is welcome and details are on my blog:
http://blogs.msdn.com/cbowen/archive/2008/07/06/giving-two-user-group-talks-on-xna-this-week.aspx
-Chris