I built WhatsBuzzing - http://heyjimmy.net/whatsbuzzing

Its use is two-fold:

1) General users on Facebook can login and see the top 40 trending topics on their Newsfeed, through statuses and comments.

2) Data is collected and access is going to be sold to third parties like advertisers, designers, and media companies. With this data they can get a real feel for what people are thinking about topics like, the World Cup, or a new movie, Coca-Cola, etc.

I just need to get users now :)