How To Determine Version of Sharepoint

When you troubleshoot a Sharepoint problem, it's often worth knowing what version you are running.

Sharepoint has really changed a lot over the years. The easiest way is to get to know the look and feel, especially the tabs. 2003, 2007 and 2010 have quite a different default look and feel that reflect the current flavor of the month!

Serverfault had a good thread on it where you can see the differences.