With drop.io you can easily send any media or content you want to all your twitter followers by just adding it to your drop. Create a drop here by clicking 'drop it' - then just add your twitter account and customize your tweets... whenever you add new content to the drop via any 'input' it will be instantly tweeted.
In the short time that I have used it, Twitter has grown quickly to play a major part in the way that I interact with fellow colleagues and professionals from around the world.