The App Catalog is awash in a flood of terrific Twitter apps, from the excellent Tweed (this blogger's current favorite) to the innovative and visually stunning TweetMe for webOS. Not only does a Twitter app have to look good these days to compete in the 'Catalog, it has to perform blazingly fast with a cutting edge feature set, and Yak ($2.99 in the App Catalog) has what it takes to be a serious contender. How does it stack up against some of the newer and established names? There's only one way to find out: by reading on after the break.