I am a big fan of the You Don't Know Jack series as a whole, and I think the recently released iOS version is one of the best ways to play the game: It's social, it's quick and easy, and oh yeah, it's completely free. And now that version is getting even better -- Jellyvision has made some deals to include celebrity guests in the game. Not only will celebrities appear over the phone during the entire show (similar to the old "celebrity phone call" gag on the old versions of YDKJ, which I really loved), but they'll also have a place in the competition, competing alongside you and your Facebook friends as you play.
The first celebrity picked to join the game is Mad Men's Rich Sommer, and model Adrienne Curry is set to join the game next, with other updates coming out on a monthly basis. I played through Sommer's show, and it's certainly chock full of plugs for his TV show, so presumably there's either some money going back and forth for these appearances, or the guys at Jellyvision are just big fans of AMC.
Even if these are paid appearances, I'm not bothered. YDKJ is a great game that's been offering lots of great free content, and adding in celebrities in this way is an excellent way to both liven up the formula and keep the lights on. You can play the first celebrity ep of the game on iOS now, and more should be available soon.