My colleague Tim Heuer shares a case study of a company building casual games with Silverlight:
The group that brought you one of the first Silverlight end-to-end games (Zero Gravity) is now featured for some of the work they've done with Silverlight 1.0 and Silverlight 2 for Miniclip.com, the largest online gaming site in the world.
You can view the Terralever case study online here. The Terralever crew is interviewed in four different segments talking about the project from a designer, developer, business and technical perspective.
The team built two casual games for Miniclip.com on both versions of Silverlight. The first, a Silverlight 1.0 game called 'Zombomatic 3000' has been on Miniclip's site for a few weeks now. It is a puzzle-based game built entirely using Silverlight 1.0 technology and the tools. The team took the vision further and had been working on Tunnel Trouble, a game with more interactivity, more logic and a more dynamic game play.
Given the amount of time I've spend on MiniClip from time to time, I'm not sure it's a good thing for me personally for there to be even more cool casual games available, but this sounds like a cool use of Silverlight 1.0, and I'll be even more interested to see what Terralever comes up with for Silverlight 2.0.