You may recall seeing Post.ly after visiting a shortened URL from Posterous blog. It’s the branded URL shortener for the blogging service that’s now open to the public, the Twitter public that is.
Post.ly is now a media sharing service for Twitter users and Posterous bloggers. From photo’s to documents, Post.ly let’s you send any file and convert it to a web friendly format for you to share. All media is hosted on Posterous and published online instantly with the option to auto-post everywhere.
There’s no word yet on file size limits (leave a tip in the comments if you know). Nevertheless, Post.ly will make uploading media to Posterous blogs a lot easier, and non-Posterous users can join in on the fun.