Here are my ideas:

http://ideashower.posterous.com/idea-smartphone-video-speed-...

http://ideashower.posterous.com/idea-dating-site-staff-of-fe...

http://ideashower.posterous.com/idea-dating-with-with-testim...

http://ideashower.posterous.com/idea-dating-site-with-voice-...

http://ideashower.posterous.com/ide-date-blocket (translation: inbox-less insta-signup dating site)

http://ideashower.posterous.com/ide-kontaktannonser-med-ultr... (translation: short dating site profiles with short duration - maybe a bit like Twitter)

http://ideashower.posterous.com/ide-barcode-dating-73473 (translation: dating via stickers with those QR codes - or the user could just scribble a unique ID with a crayon on the toilet stall walls)

http://ideashower.posterous.com/ide-create-your-own-dating-s...

http://ideashower.posterous.com/idea-dating-site-with-gamifi...

http://ideashower.posterous.com/idea-walk-in-my-shoes-dating...

http://ideashower.posterous.com/idea-lunch-meetups (not dating, but similar)

http://ideashower.posterous.com/idea-dating-site-that-gets-r...

http://ideashower.posterous.com/idea-misc-dating-site-ideas

http://ideashower.posterous.com/idea-systemic-general-proble...

Here is my blog post on same topic -

http://blog.anujkumar.com/post/10513302814/online-dating-pas...

My idea is to not make a "dating site" but make a "hangout" site that focus on real world hangouts with real friends and fof. Recreate the atmosphere of college online.