I saw on the Alexa blog a pointer to this really interesting site where sites are bought and sold on their alexa rating, it’s called Alexadex.
I really like the idea, and I’ve thought about doing the same thing for social bookmarking activity. What I like about it is that markets have a really good predictive ability, and I think it would be interesting to see if a social bookmarking market could outperform news/blog sites in finding new and interesting stuff.
Of course on the other hand, it’s possible that blogs make the news, not the other way around. It may be impossible to predict what will be popular ahead of time because what is popular depends purely on the whims of whatever the boing boing editor decides to put on their blog. In any case it would be interesting to find out.
Unfortunately what’s missing from Alexadex is the ability to get a good sense of what sites are up and comers, and I get a feeling that the share prices are all very volatile. It would be interesting though if Alexadex published an API in turn.