As ScottGu announced in the Mix08 keynote today, we now have a full, rich set of controls built in to Silverlight 2. 


Kathy Kam recently created a very cool control viewer to show off all the great built in controls.  

Oh, and don't forget about the really rich set of controls produced by our eco-system.  Just a couple of examples:

Nov '08:  Updated the link to the RTM version of the samples page:
Also, be sure to check out the Silverlight Control Toolkit: