Between text messages and the Web, there are about a million ways to use Twitter on your iPhone, but ThinCloud would like to think that its sheer style will make you bookmark it for future Twittering. What makes ThinCloud so special? It's very finger- and eyeball-friendly, much more in fact than Pockettweets, which we took a look at last week. It's got huge buttons and a friendly graphical interface with thumbnails for browsing and checking up on your friends. Unlike Pockettweets, however, there's no way to star (or favorite) messages you like.