TwitDoc.com

"The central idea behind TwitDoc.com is to make it easy to share your documents on #Twitter. Before TwitDoc.com, you would upload your document to the internet, shorten the URL to link to the document, and post a tweet with the shortened URL to Twitter. With TwitDoc.com, you can do all of these steps at the same time. TwitDoc.com offers a free web-based upload form, a downloadable desktop upload utility, as well as an API for Twitter clients and web developers. And although TwitDoc.com is primarily built around the idea of sharing documents (PDF, DOC, XLS, etc.), we also handle many image formats (JPG, GIF, PNG, etc.) and expect to support other file types in the future"