Steve Stafford tweeted a link to this thread. It shows the major milestones in Revit development, including company acquisitions, product renaming and discipline-specific additions. For example, here are the release dates of the very early versions:
Revit Technology Corporation
1.0 2000 04
2.0 2000 08
2.1 2000 10
3.0 2001 02
3.1 2001 06
4.0 2001 11
4.1 2002 01
Read more at:
Revit Timeline (W.I.P.) – AUGI
If you want to see a video of version 4:
Revit History – Revit 4.0 video
And here is a screenshot of version 3:
