email me at eric at writewith dot com if you have a good story idea.
VentureBeat is great with high quality content and a relatively savvy readership.
Buzz is for people who cannot build a useful product.
Once you have a useful product, it's not 'buzz', it's marketing. Hire a suit for that.
(In other words: shouldn't this depend on your product and your target market?!? Or is everyone just building generic Web 2.0 apps that only appeal to alpha geeks?)