For anyone familiar with games like Dominion, Settlers of Catan, Pandemic, and similar, you might find this interesting: there's a downloadable program that provides multiplayer-capable play of a bunch of German and similar card games. It's mostly in German, which is a minor problem, but the cards generally come up in English and the bits that don't are easy enough to figure out.
This site provides a guide (http://shachiku.com/2010/04/26/tutorial-how-to-play-dominion-online-for-free/) to help in getting set up and playing. There's a lot of open games, and if you have a few friends who have downloaded the client it's quite a lot of fun.
I already have it and play Dominion a good amount. Really addicting game ^^;