The folks at DevX are running a contest for Silverlight 2 games, the deadline has passed, but a few entries are up on their site now:
http://www.devx.com/RIA/Door/37728
I'm a bit partial to one of the entries, Stack Attack. I heard about the contest about a week before the deadline and decided to see if I could write a game from scratch in a few evenings using Silverlight 2. Stack Attack is the result, and I think it turned out pretty well. If I had a bit more time I would have added high scores and polished it a bit more. Please go and play my game and the other entries and let me know what you think!
This is a direct link to the Stack Attack game page:
http://www.devx.com/RIA/Game/37741?id=271
A couple of strategy tips in the game. Diagonal lines are worth the most, followed by horizontal, and lastly vertical. You get bonus points (2x or more) for getting a "combo" (2 or more lines at once) and you also get bonus points when a line collapses and causes another line. Also lines of 4 count as 2 lines, and lines of 5 count as 3, which can help you get to your goals easier.
Enjoy!