Tech Memeorandum is a fine place to catch buzz — if you just want to hang out with the other top bloggers. But TechCrunch's Michael Arrington can get you in early.
The influential blogger took "tracking Web 2.0" to another level this week. He started an Alexadex account, where he now buys play-stock in sites before he writes about them. But today, he bought Ning.com shares. Mike hasn't written about Ning yet, but he knows something's gonna happen.