Over at the Rx forums, Eamon_OTuathail has created what seems to be the list of Rx sites. It is a list of Blogs and open source projects.

Great stuff. This should save a lot of time for a lot of people.

http://social.msdn.microsoft.com/Forums/en-US/rx/thread/2cbd3b1c-d535-46ba-a9cf-3cd576a8e7c2

Humbled to make the grade.EDIT: Hopefully www.IntroToRx.com will also make the grade. It is the online book that evolved from the blog series.