Ask HN: Is their a site that exists purely of ideas for websites, apps, etc?

Not about websites, but cool anyway:

http://www.halfbakery.com/

http://www.reddit.com/r/SomebodyMakeThis

thanks for the links guys. we are actually working on a website to allow anyone publish ideas and connect with others who would like to contribute to it. we've launched a prototype two weeks ago : http://gullibear.com/ and a new version is on its way. would be the sort of site you thought of ?

http://theinternetwishlist.com/ sort of fits the bill...

Yeah, that site isn't too bad. I wish it was a bit more complex, however, with sorting or filtering features! Thanks for the link, though!