I couldn't resist jumping on the Silverlight bandwagon. So I created a Silverlights Out game. Just something quick and dirty to get a feel for the technology.
I had to try and improve on the orginal so I'd made the game toggle lights across borders. So if you click on a light on the left, it will effect the light on the other side and vice versa. Enjoy. :)
I've got some plans for some nice improvements, so stayed tuned.
Silverlights Out
See it!
http://www.cjcraft.com/Blog/content/binary/silverlightsout.gif

Use It!
http://cjcraft.com/silverlight/silverlightsout/silverlightsout.html
Download It! (source code and all) [quick and dirty garage project, that's why it is so CHEAP]
http://cjcraft.com/silverlight/silverlightsout/silverlightsout.zip
Umm, Describe It!
Lights out is a one player puzzle that is played on a 5 by 5 grid of squares in which every square has two states: on and off. The game starts off with all squares off, where the goal is to turn on every square. By selecting a square, all the surrounding squares' (up, down, left, right) state is turned toggled. For example, on a 3 by 3 grid of squares with all squares off, if the center one is selected, it will turn "on" the 4 up, down, left, right squares from it.