Okay, I have to admit that I never dreamed I would be advocating an API for Area51. But here I am doing it :) I think we need an API for Area51. Granted, the whole concept of questions and answers is ...
Several applications come to mind, proposal publicity, question analysis, making resources files, but I can't find any SE API calls that can do this.
This issue has recurred (and is ongoing) as of a couple of weeks ago. Most notably, as before, the on_site attribute is missing from Area 51. This is API 1.0, by the way.