If you envy iPhone and Android phone users because they get to play Draw Something, but you, the WP7 user don't, well fret not, for even though the developers has more or less taken a pass for Draw Something on WP7, there is a similar game on the Windows Phone that you'll be able to play, it will help you tide over the absense of OMGPOP's popular game, and this game's name is Duudle by VISIARC. This game has been out even before Draw Something (Dec 2011, whereas Draw Something was released in March 2012), you can say that Duudle is the rightful predecessor, but it doesn't matter because it's still obscure.
The 2 games are rather similar in style, you have to illustrate words that are given to you best you can for your friends to guess. Unlike Draw Something, Duudle has a time limit, once the time is over, the picture that you created is redrawn for your partner and they will get more points if they manage to guess the words faster. It is like charades but for the new generation. Duudle players on the WP7 can play with people on Android if any of the dozen WP7 owners all happen to be offline.
Draw Something for WP7 is not happening, but you can settle with Duudle, it's about 3 bucks and it's available in the Windows marketplace.