I've put together a partial timeline of the Debian project using the SIMILE Project's DHTML timeline component.

This is definately work in progress: I would welcome additional events (by email or merge request please, not via blog comments) regarding:

Dates of the earlier Debian releases

Release freezes

Interesting dates of important packages and tools (Linux kernel, XFree86/X.Org, glibc, aptitude, etc.)

The timeline is available to view here.