There has been some real good content generated by the communities for SMS2003 SP3 so far, and here is my ten cents worth in the form of a quick review located here.
Also, if you haven't checked out Roger Zanders SMS Client Tool (not the SMS toolkit version ;-) then check out a brief review and heavy linkage here :> Sherry Kissenger and myself converted the documentation to English, go check it out :>
Keep up the good work Rod\Ron, the new site is looking awesome :>