a stock market predict tool
maybe I can use text categorization tool to act as a stock market predict tool

news ==> categorized by stock market future result, (up down)
next time, when we see news go to which category, we know it will go up or down.

there's two papers describe my previous idea
Daily Stock Market Forecast from Textual Web Data (1998)
Daily prediction of major stock indices from textual www data (1998)
http://www.cwu.edu/~borisk/finance/smc98.pdf

News Sensitive Stock Trend Prediction (2003)
Gabriel Pui Cheong Fung A1, Jeffrey Xu Yu A1, Wai Lam A1
They totally implemented my idea, and had a pretty good result.

I've tried MAS on sourceforge, pretty good, can give you graph, signals, etc.
tried for two weeks on virtual stock exchange, but no good result,
cause the program is too theoretical, when it tells me to buy, I can't get the stock immediately.