Specifically, I've been participating in AskAboutProjects a bit. What is the difference between the 'Stack Exchange' pull down on these sites and the list at http://www.stackexchangesites.com/ ? Why does AskAboutProjects appear to be listed in only a few listings of SE sites? Are there criteria that must be met before a site will appear in the StackExchange pull down?
I found this question, but I don't know enough about the design of the various SE sites to know whether it applies to my question. What's a 1.0 or 2.0 site? Does it even apply to what I'm talking about here?