Is there a site which catalogs startup ideas?

There's also a subreddit you may be interested in http://www.reddit.com/r/SomebodyMakeThis/

Ideabing is a website that aims to share ideas - http://www.idea.ideabing.com/about/

news.ycombinator.com :)

I was looking for something like this last week then decided to build leanthingy.com.

CrunchBase.com

sparkmuse.com is a growing interest.

http://www.ideaswatch.com is a website where people share and discuss startup ideas.

got an error when i clicked on NEXT.. nice site btw, straightforward and informative :-)

The site isn't mine, I remember coming across it on KillerStartups a while ago.