How to be open without being open-source

Joel has been teaching us how to do that for years. Now he even publishes internal product specs on the web. Interesting read.

Unlike most, this software project does not have a lot of UI, actually it is a kind of simpler Remote Desktop, so it "borrows" all of it from the OS. But in regular projects I think that software specifications should be mostly UI mock screenshots. Images are really worth a thousand words.