33553bf0_Web_oranges__3
[0] Reusable components [Wild Pockets] 1 [Silverlight] 1 [3] 
Wild pockets offer a limited but very usable gallery of components. The quality is not very high but this will probably change when they begin monetizing the environment. Silverlight in the other hand is backed by multiple libraries (see codeplex.com)
Web oranges
3