Basecamp customers Seventh Degree, a web consultancy based in Orlando, recently posted a quick video that shows one year worth of messages for a project:
We've used Basecamp to manage the Online Classes project for Full Sail. The collaboration has been awesome between the IT, Education, Curriculum departments and many others. The video below shows about a year of use of the messages tab of the LMS Development project, one of over a dozen other projects related to this same effort.