I was over at Killer Startups - a site that has really taken off in the past couple of weeks - browsing many of the new Web 2.0 players for anything stock market related and stumbled on these:

Stock Cloud is an interesting data mining or data visualization experiment - they describe it as a

tag cloud like display of stock ticker symbols. The larger the ticker symbol the more frequent that company distributes press releases.

Wikinancial allows you to backtest stock picking and trading strategies.

iMiners tracks press releases - as does Stock Cloud - but it provides a search interface and then breaks the press releases into categories.

Wall Street Pop is another Digg-esque stock market site. I am afraid that the stock market is much too diverse to analyze or to get alerts from an interface like Digg’s interface. It is an obvious application of the Digg paradigm to the financial markets, but I don’t think it works.