Messages Screenshot from Basecamp

Messages are the foundation of Basecamp. Messages can announce project updates, show design reviews, ask questions, solicit feedback, and more. Messages appear in reverse chronological order so the latest information is always at the top of the screen. Messages can contain text or images and can be supplemented with specially called-out links to files and web sites.
Screenshot highlights

1. Messages appear in reverse chronological order and can contain text, images, and bulleted or numbered lists.
2. Messages can be supplemented with links to files and web sites. Add links to deliverables, documentation, design comps, or anything else you want. Icons are automatically added to the links based on the filetype.
3. Your logo appears on the "All Messages" page.
4. Assign your messages to custom categories.
5. "What's fresh?" sidebar gives you a look at the most recently commented on posts.