 If you liked
Kami nomi zo Shiru Sekai
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 ...then you might like
Sword Art Online
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I was very surprised to find that these weren't already recommended for each other.
I can say with confidence that if you like one, you'll most likely like the other.
both deal with gaming turning into something more real. although the game subjects are different. The art is really similar in both.They are so similar on atmosphere, that you must watch both. I MUST stress on thing though, if you are into SAO for the fighting, you may not like the other, for it has much less action. it has more ROMANCE.