If you are still unsure what xRM from Microsoft is then perhaps this video called Introduction to xRM will help.
John O'DonnellMicrosoft Dynamics ISV Architect EvangelistMicrosoft Corporation (b) http://blogs.msdn.com/jodonnell
(b) http://blogs.msdn.com/usisvde
(w) http://channel9.msdn.com/Wiki/DynamicsCRM/HomePage/
(t) http://www.twitter.com/jodonnel