I got a trial account, but am having some problems loading a 92k csv file I uploaded, seems to hang at about 7 percent.
Better luck with a smaller file 5 columns 29 rows.
In school I’ve mostly used spreadsheets with my classes to produce graphs, there doesn’t seem to be a charting facility in google spreadsheets yet.
There is I am sure a case for making simplified versions of these web 2.0 online tools for children covering spreadsheets and databases. Full-blown applications are overkill for most primary needs.