I've been involved in two different game projects this year (2010).
The latest one is called GRAMMATIKUS, which is an online education tool designed for high school students - a multi-player, web-based game that focuses on teaching correct English.
This is the design of the Seal of an important Tome in the game story.
Grammatikus will be open for registration in late 2010 www.grammatikus.com
A language it is! I wouldn't call it grammar, but it certainly has a set of tools that are important to learn about. At least if you're looking for any kind of resemblance to reality.