Quarrel Deluxe will be free later tonight.
I've had this game on my iphone for the better part of a year, and, IMO, it's one of the best word games available on ios. It conbines a Risk-like conquering element with traditional anagram solving, and throws in a lot of neat tricks along the way. Only 2 problems: no multiplayer, and the dictionary used is somewhat ridiculous in scope (supposedly it's the Scrabble dictionary) and the A.I. Isn't afraid to use it. There are also new puzzles each day.