MongoDB and others, convince me. :-)
My experience is that almost any application can be broken up and thought of as tables. Especially in the business world, people naturally think in terms of spreadsheets since the spreadsheet is king there. And a spreadsheet is nothing but a table.
It is always important to try to see things from the other side of the fence too.
via: http://www.mentby.com/Group/nyphp-talk/mongodb-and-others-convince-me.html