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Ehm, I might miss something but I can see nowhere that there are builds available for Linux. Could someone point me to where this would be available?

It will be available at https://atom.io. It's not quite ready, but you can see a screenshot here: http://discuss.atom.io/t/linux-build-screenshot/6317

Right, then I fail to see the value of this submission at all. Maybe should hint in the title that nothing usable have been released yet.

Not yet. Just a peek at Github's internal build.