(don't worry, I'm not going to ask anyone here to do a survey for me)
how does it work at the end?
do any of them let you directly illustrate the data from their site, like with charts or whatever? or do they just give you the data.
(basically I have to do a long presentation on a key text next week, and it has to include an element of class participation, so I want to get everyone to do some live research based on some of the book's themes/ideas, so I'm really hoping there's somewhere I can just log in to, press a button and graphically display the results)