Why do we need this?
Right now it's very hard for advertisers to understand the blogosphere. i.e. There is no way to know what the 25 biggest TV or gadget blogs are. You can go to Technorati and see results based on their unfinished directory, but that is ranked by inbound links which everyone knows is easy to game...
What do you mean by critical mass? I heard you said if you don't have 100,000 pages a month don't bother.
In my experience advertisers are just not going to bother with a blog with under 100,000 page views a month. It not because they don't like you, it's because it's inefficient. However, Google Adsense, Tribal Fusion, and AdBrite have solved this problem already--they will work with growing sites. I still think it would be a good idea to put your blog in the directory if you are looking to build it into a real business because at least you'll start getting brand exposure even if advertisers won't buy till you hit their minimum benchmark (which might be 250,000 or 1M pages a month!).
Hmmm. So this won't really effect anyone but those huge blog networks...who would probably find advertisers pretty easily anyway. (I could just be really tired right now, but that's how it looks to me.) I mean, does Steve Rubel even get stats like that? I guess the only hope for the rest of us bloggers (with our non-business blogs, anyway) is to stick with much-abused networks like Blogger/Google AdWords -- or start vertical networks of our own, in hopes of hitting critical mass.
Makes sense. Calcanis is right. Larger advertisers really won't bother unless you have that volume of traffic -- unless you're very, very niche.