This conference is held every year around this time to "get the best startups and launch them in front of the industry's most influential VC's, corporations, and press". Launching a startup is never easy. The best ideas out there are sometimes poorly timed or managed. 98% of startups fail within 5 years. On the flipside if all goes well, I will be there next year myself with my own green company. Here are this year's finalists: http://http://www.techcrunch.com/2008/09/08/announcing-the-techcrunch50-finalists/ (I figured out how to link on my blog!)
A few of what I think our the best ideas:
Blah Girls - it's has Ashton Kutcher's backing and gossip, it's a winner for the tweens
LiveHit & QuantNews - both use web based applications to track web PR/clicks
Exchange P - fantasy stock market for private companies
ICharts - Youtube of stock charts
Mobclix - monetizing IPhone apps
Bojam - musical collaboration over the Internet
Closet Couture - like the Clueless closer on the Internet