If you liked
Suzumiya Haruhi no Yuuutsu
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...then you might like
Angel Beats!
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Both shows have a similar atmosphere and share a high school setting (although angel beats is set in the 'afterlife'). They both have elements of mystery and humor and some of the characters are quite similar like Haruhi<-->Yuri and Otonashi<-->Kyon.
If you liked
Kuroshitsuji
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...then you might like
Pandora Hearts
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Probably been recommended already but I think it's worth mentioning again - both contain an older servant protecting a younger master - similar characters such as break (pandora hearts) and the undertaker (kuroshitsuji) and the relationship between sebastian/ciel is similar to oz/gilbert - they both have a supernatural theme which can be dark (more so in kuroshitsuji) but also have occasionally humor (more evident in pandora hearts) - both are very entertaining animes so I reckon if you liked one of them give the other a try ^__^