 If you liked
Haiyore! Nyaruko-san
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 ...then you might like
Acchi Kocchi
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It's hard to exactly say but I found both of these series similar in a few ways.
Both series takes place at a school setting that features a strange cast of characters.
Both series have a lot of comedy and humor to every episode
Both series features a strange main female protagonist who has a strange fascination in the main male protagonist.
Both series are lighthearted that also has romance themes
Both series follows an episodic like theme where each episode presents a new gag of comedies.