*cough* Thinking about Penguin Brothers? 
Seems to me that Ouran Host Club is unique precisely because it's a reverse-harem comedy shoujo series. Very rare, unless you bring in the shounen equivalents. (Shounen harem comedy... should I even bother to list the huge variety of those?) Perfect Girl Evolution does seem to come closest, in my opinion. I can see the connection with Hana Yori Dango, though (especially with the "poor" aspect, and the strong personalities of Tsukushi, Doumyoji and Rei).
Hmmm... I wonder if parallels could be drawn to Fruits Basket (anime) or Honey and Clover. Both contain fairly insane groups of bishounen surrounding a female. (Ooh... now I want to try and match up everyone! Tamaki = Shigeru, Kyouya = Yuki, Hikaru = Kyo, Kaoru = Haru, Honey = Momiji, Mori = Hatori. Okay, it's not perfect, but hey! :P And Ren could be Ayame... or whatever Yuki's older brother was called... it's been a long time since I read Fruits Basket). Still, the comparison drops as you progress further in the series, though. Fruits Basket turns dark and angst-ridden, while Ouran High remains light.
In terms of the over-the-top comedy that Host Club delivers, though, I can only name Ranma 1/2 and School Rumble which gave me the same feeling. Sumomo mo momomo came close near the beginning, but it degenerated after a while. Of course, those are all shounen series.
-Dizzy-
Manga Genre Focus: Romance, Comedy, Slice-of-life. Primarily shounen, then seinen and shoujo.
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