Tweetbot ($3 in the App Store) is an excellent Twitter client for the iPhone.The apps unique interface and brilliantly implemented gesture support make it not just a powerful tool for reading and posting tweets, but a fun one, too. Swipe to the right on a tweet to see the full conversation surrounding it; swipe to the left to see replies sent to it. Tap and holdon a tweet, a hashtag, a username, or a linkto expose contextual options related to that element. With support for services such as Tweet Marker (for keeping you in sync with your device or desktop Twitter client), Instapaper, and more, its a full-featured Twitter app thats a delight to use.
The App Store offers oodles of asynchronous one-on-one word games, but Letterpress (free in the App Store), with its innovative gameplay, stands out. Theres an element of Words With Friends, in the sense that you want to find the best words you can make with the available tiles, but Letterpress adds Risk-like strategy to the mix. To win, you must carefully take control of the board: Tiles turn blue when you use them, but your opponent can turn them pink by using them on his or her turn; only tactical tile usage can lock certain tiles to your color. When all tiles are claimed, the player with the most tiles wins. Letterpress is the rare word game where a mastery of vocabulary doesnt guarantee success, because you must master the strategy, too.