[jeromec]

If you have not read the Request for Startups Paul Graham has started posting for YC I highly recommend reading it here http://ycombinator.com/rfs.html.

These can spark ideas to work on while possibly providing an edge to be accepted into YC. The other road I'd advise is to think about things you're already passionate about. If you can find a passion you can monetize you have most of the battle won IMO (tip: start blogging about it and build an audience which may also turn into your first customers).