Love it or hate it, Twitter is here to stay, so you might as well sign up and arm yourself with the best app available: Tweetie 2. It has been significantly revamped from its original incarnation and now handles multiple Twitter accounts, translates foreign tweets and links Twitter contacts to your address-book contacts. You can also perform basic functions, like reading and tweeting, offline — and everything automatically syncs when you come back online. Tweetie 2 even syncs with your desktop version of Tweetie.