There has been some interest shown for a Draw Something app to be made for Windows Phone. There are already apps available for both iOS and Android, allowing friends (and random people) to compete against one another by drawing illustrations and guessing correctly. A thread over at GetSatisfaction has over 800 people wanting the app brought to Microsoft's platform.
Joseph, an official representative from OMGPOP (developers of the title), has stated "if there's a high demand for it", then they'll definitely look to develop an app for Windows Phone.
Be sure to head on over to the thread at GetSatisfaction to show your interest should you desire Draw Something for Windows Phone. You can also get in touch with OMGPOP directly.
Source: GetSatisfaction; thanks to everyone who tipped us!