There is a simple but nice multi-language collection of statistical tools for epidemiology, that is free and open source, works inside the n800 browser Opera (but *not* with MicroB. at least in my hands), both online and offline.

http://www.openepi.com

If you are interested in epidemiology, try the online version from the site. If you like it, you can get the offline version from http://www.openepi.com/Downloads/OpenEpi.zip . Just download, unzip in a directory, and open the index.html file from your browser.

It's quite interesting

I highly recommend www.statcrunch.com for online statistical analysis. Very powerful and you can shar with other online users. $6 a year to play.