Check out my YC app demo - rip away
roundsquare: Neat idea.  But I wonder, what are you offering that excel doesn't?  So far, the only tool I can see is 
y vs x and thats not tough to do in excel.  I'm not saying  you aren't offering anything, but I don't know what it is.For the interface, a few things I didn't like, but others can chime in.1) When I click on "Basic Statistics" I see the tests there.  Then, when I click on "Multivariate Statistics" the basic title bar drops down to the bottom.  If I were trying to look for a test to use, I would want to scroll through each category.  They way you have it makes that tough.2) When I go to analyze a data set, how do I get back to the list of files?  I figured it out (click on Data Management) but that should be easier to find.Also, something that I think would be very cool would be to allow me to take data sets from different files.  This would allow me to use your app as a storage for my data sets.  I could organize files however made sense to me and then arbitrarily go there and look for correlations.  "Oh, I wonder if there is a correlation between temperature and mortality.  Lets take the weather file and the mortality file and check."