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Recently I discovered the "Data" link at the bottom of the SE sites. It's a very cool tool. I also noticed that Programmers.SE is not in the list of sites that can be queried.
Is it safe to assume that the "Data" link is for all NON-beta sites?
No beta sites are accessible with Data Explorer, only finished sites and their beta's. I'm working on a scraper to reconstruct as much of the DB as I can, but it will take some time before I get a release.