Yeah, I think anyone who's been following my answers so far is going to guess that my favorite licensed RPG is Doctor Who: Adventures in Time and Space. In addition to what I said in the "Favorite Game System" post, there's the dizzyingly vast world of possibilities in that setting. Want to create a whole milieu of your own? There's room for it. Want to throw together a selection of characters and settings from a catalog? There are tons and tons and tons of them. You can't lose.