One question I have strugled to answer clearly in past is What is the difference between Windows Sharepoint Services (WSS 3.0) and Microsoft Office Sharepoint Server?

The first difference is in the name, and is best highlighted in the words of Richard Campbel of DNR/Run-As fame:  When it is a service it is free, when it is server you have to pay for it.

The following diagram shows how I keep them apart in my mind:

To explain a bit: this is not a complete list of features, and not the most important features, just my favs

So if you have any features that you think are really important and didn't get a mention, leave me a comment!

Listening To: You're Living All Over Me, Dinosaur Jr.