Want to cash in on the Web 2.0 craze but don't know how? Make a Web App has the perfect idea for you! Success 100% guaranteed!*
Refresh for another, and don't forget to check out other people's favourites in The List:
It brings atheists and seniors together through a discussion forum on books. We'll call it HardIn.
"Money Maker"

Zuckerberg wants in.

It allows procrastinators to create real estate together through a web service. We'll call it BuildOn.
Idea created by Josh Sharp, who also makes real web applications for those with sensible ideas.
* success not guaranteed.