Draw Something: Draw Something puts Pictionary onto your phone. You can play with strangers or friends on Facebook and take turns drawing pictures. Choose between easy, medium or hard choices to draw.
TwitterScrabble: Although this microsite is originally in Dutch, playing Scrabble is pretty universal. You can play Scrabble with anyone in the Twitterverse. You're given a set of 100 random characters to make the best word you can and tweet it when you're finished.
Scramble with Friends: Every time Zynga comes out with a new version of "Scrabble" I download and play it for a good month or so before moving on to the next one. I'm currently stuck on Scramble with Friends. I'm sure a majority of "Words with Friends" fans are already playing this game, where the object is to find as many words as possible within a jumbled grid. You can go horizontally, vertically and diagonally to string letters together to create a word. Just like most of Zynga's games, it's very addictive — and it's timed to be a lot quicker to play than "Words with Friends" or "Hanging with Friends."
(Images: Julienne Lin.)