gwern comments on Dual N-Back browser-based "game" in public alpha-testing state. - Less Wrong
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A decent (randomized, has placebo control) recent article finding no transfer here (pdf). Not saying this is the final word on dual-n-back but enough for me to spend time elsewhere until more evidence comes in....
There's still at least 1 more study coming out, one involving Stephenson (whose 2010 thesis was one of the strongest datapoints, according to my meta-analysis). I've been told that it found transfer to fluid intelligence when using visual single n-back, but not audio n-back.