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I love this one:
http://www.youtube.com/watch?v=kDqCKqjBxtw&mode=related&search=
Its a mixture of Lucky star and the host club!!

yea!
kudo's to the creator(not me)
I love that one.

Oh joy, here comes MY list of favorites on youtube that are Ouran related XD only one overlaps with the ones already posted, and that would be the happy song one, hehe. So I'm not gonna link that one xP

http://www.youtube.com/watch?v=gfGHtSoeH-M - Hikaru and Kaoru to the song "White Flag" by Dido, I may nto eb a fan of them as a 'couple' but this is a really beautifully made one :>
http://www.youtube.com/watch?v=dJiM4ja5YZg - "Bad Boy"
http://www.youtube.com/watch?v=4b47nOIPVT4 - "Listen to your heart"
http://www.youtube.com/watch?v=7-XCu1F88yo - Tralala song (kyouya)
http://www.youtube.com/watch?v=AU9XJfm5fBU - "LaLa" (ashlee simpson song... shoosh, elite beat agents got me addicted to that song D8 )
http://www.youtube.com/watch?v=n-gpRN3kAuk - another one about the twins 8D;
http://www.youtube.com/watch?v=O-mI1Mp6cHU - "Girlfriend"
http://www.youtube.com/watch?v=X__5s8DyrkQ - "Japanese Boy"
http://www.youtube.com/watch?v=PmIRprDOCd8 - "Summer Nights" (Grease song)
http://www.youtube.com/watch?v=mb1KY6CwLjY - "You're the one that I want" (also Grease)
http://www.youtube.com/watch?v=xteanEpwLro - "Shutup and Sleep with me" 8D;
http://www.youtube.com/watch?v=qZU1ouU12Tk - "the host nobody likes" (dane cook skit)
http://www.youtube.com/watch?v=QgKaC3GzRQE - "Everything you want"
http://www.youtube.com/watch?v=MYUT62aWqiY - "One Week"
http://www.youtube.com/watch?v=C3L-NdYK5vk - "Shut Up" (Korean song XD its so funny jsut for the way it sounds)
http://www.youtube.com/watch?v=yGP0cIhWGpw - "Boom Boom Boom Boom" venga boys song XP
http://www.youtube.com/watch?v=FceeVzqzyfQ - "Hamster Dance"
http://www.youtube.com/watch?v=o7Rla-aCxnA - "Razzle Dazzle" (I think that's from Chicago... didn't care for that movie much.)
http://www.youtube.com/watch?v=7_BczpVV8mw - "So many Men"
http://www.youtube.com/watch?v=7cS4wLSGt4w - "Ike Ike"
http://www.youtube.com/watch?v=NUuReVsn_J4 - "Build God, Then We'll Talk"
http://www.youtube.com/watch?v=fFtThf3C1YQ - "Story of a Girl"
http://www.youtube.com/watch?v=mBh8soEM4h8 - "This is Halloween" (P!atD version)
http://www.youtube.com/watch?v=Vh_peXHCX04 - "The Internet is for Porn" x3
http://www.youtube.com/watch?v=H1oLZE9MkcE - "I Write Sins not Tragedies"
http://www.youtube.com/watch?v=MdFtngWO2Pw - "Lying is the most fun a girl can..."
http://www.youtube.com/watch?v=t-b09TAnQQ8 - "Feel Good"
http://www.youtube.com/watch?v=HtbsFSzkflg - "Wannabe"
http://www.youtube.com/watch?v=JyzKuawUQAE - "If You Were Gay"
http://www.youtube.com/watch?v=RzZ7WTGHnk8 - Mortal Kombat Theme 8D;
http://www.youtube.com/watch?v=wIOSsmtdvZ4 - "Dream a Dream"
http://www.youtube.com/watch?v=MqjIIZ_jPcQ - "Can't Touch This" (family Guy version)
http://www.youtube.com/watch?v=ZgVWc9OZVnM - "I like a Boy in Uniform"
http://www.youtube.com/watch?v=OLvCsesbtRI - "Witch Doctor"

aaaand that's it, I used to have more in my favorites, but they got removed or something *mourns the loss of the 'Happy Boys and Girls' one crying *

HARUHI GOT BACK >DD

These are ones I saw others put up that I would have:
"Tamaki is Really Really Happy" = LOL!
"If you were gay" = 5 stars, that ones great XD
"Dream A Dream" = on my lookup
"I like a Boy in uniform" = so cute razz
"Witch Doctor" = So perfect XXD

My additions:
"I must be dreaming" http://www.youtube.com/watch?v=7jUQpK8bHRY
"Hey Ya" http://www.youtube.com/watch?v=J05a3_4oB1w
"romeo and juliet of ouran high school host club" http://www.youtube.com/watch?v=7t_yEFF1IEM
"Halo" http://www.youtube.com/watch?v=5Hu6Euw8TNQ
"Just the Girl (Tamaki's Looking For)" http://www.youtube.com/watch?v=BzQs40jUet4
"Tamaki wants to 'Talk About Me'" http://www.youtube.com/watch?v=xR6x7CX0-gk
"Take Me or Leave Me [Kyouya/Tamaki]" http://www.youtube.com/watch?v=sxNrmUsljvQ

If nothing, you should try watching this one, it's a good vid and goes together really well...
"Be My Escape Kyouya/Tamaki" http://www.youtube.com/watch?v=wpkMePVzQuo