Publr is a free, simple micro-blogging service that lets users upload text, video, and audio posts, as well as several other media types. The Publr API allows developers to create their own applications that can interact with Publr data/posts, using either XML-RPC or simple HTTP requests.
Publr.com is a free blogging service with a few innovative features. It allows posts of various types, including your typical text, but also including maps, videos, chat transcripts, and links. Its site has a pretty good typical web interface for such things, and there are both first-party and third-party applications to use to post. Those third-party applications use the Publr API.