Well, SAO is part of a genre of anime that involves people getting trapped in virtual reality MMORPGs. As such, it's remarkably similar to the .dot hack series, and also, I would imagine, Log Horizon (though admittedly I haven't watched much of the that one). There's also No Game No Life, which revolves around two gamer siblings who get sucked into another world, but it's a bit different.
The person above me mentioned Psycho-Pass and Death Note. These are both great shows, but I personally would classify them more as psychological thrillers with some sci-fi elements. They are both intelligent shows which discuss human morality on a pretty deep scale.
Serial Experiments: Lain, Ergo Proxy, Cowboy Bebop, and Ghost in the Shell are basically required sci-fi viewing for any anime fan worth their salt. I'm not saying they're like SAO, but they are gold.
Lastly, a personal, underrated favourite of mine would have to be Deadman Wonderland. The only problem with it is that it ends abruptly and there will be no series two, as it's way more popular in North America than it was in its native Japan. If you like it, there is a manga series available which is also very good. The anime covers the first eighteen chapters or so.
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