the Windows Twitter client you'll love to use. Frenzy uses Dropbox to store your feed items and keep everything in sync. You don't need another account and there's no other server involved.
Tweetcube is another service that adds additional functionality to Twitter. If you have been following MakeUseOf for some time you probably already know how to post voice messages, images and even sharing what you're listening to. TweetCube brings a new feature to your Twitter experience by letting you easily share files.