WebStat is a great statistical computing site for comparitive data analysis with various language based capabilities. I was able to view a demo on existing gathered sample data, read thru procedural instructions on how to generate and display statistical results using plots, graphs, charts, and table information to show your data effectively.
Even though I found the site to be navigationally easier than most, please ignore my earlier 9/29 posted comment of "testing 1, 2, 3 ..." I wanted to make sure today I was able to post my comments. On 9/28 evening I attempted two times to post my comments about this site and I was unable to do so. Perhaps due to technical difficulties ... anyway, I do however believe this site is very user friendly otherwise, offering additional computer based language program interfaces and capabilities for www access.