Taskbarn is a web-based project collaboration tool with a focus on ease of use, transparency, and feed-friendly updates.
Taskbarn covers the basics of project management, including assigning due dates to tasks and marking parties responsible for completing them. In addition to the standard tools, each project is set up with a unique feed. Updates to the project can be published both within the Taskbarn feed and to an external Twitter account. Each feed update can be given a file attachment of up to 10MB—handy for tossing in pictures and voice messages to keep a group posted on progress.
In addition to task management and publication of project updates, there is a messaging system for keeping up with your fellow collaborators and a notes section for attaching notes and files that don't quite fit into the task list. There is a 100MB limit on file storage, so if you're working with bulky multimedia files, you'll need some alternate storage space. Taskbarn is a free web-based service.