DZone.com has published a cool little reference card for Silverlight 2, written by Chad A. Campbell, who is a gun in the Silverlight world and has written a book called Silverlight 2 in Action.
The RefCardz as DZone calls them have heaps of great little tips and hints and are excellent to have lying around when you need to quickly look up how to do things.
Get it here!
They have a heap of other RefCardz there as well for other platforms and languages written by experts in their field.
So check em out!