Mercurial
I’ve been meaning to look at the Mercurial source-control system for about a year now. It’s Python, it’s distributed. Sounds like a winner. But I go to their home page, which is a Moin wiki, and…well, where’s the darned introduction? I was hoping to find a document along the lines of, “This is the SCM system for you, and here’s why.” The QuickStart motivates use of the system by showing how lightweight it is to get started, but that’s a do-it-yourself kind of sales pitch. I guess I’ve been reading too many ebullient research papers, but I figure if you built something cool and want people to use it, you should—clearly, concisely—tell them what it is and why it’s better than everything else that’s come before.