Yup. See http://bret.appspot.com/entry/how-friendfeed-uses-mysql http://bret.appspot.com/entry/how-friendfeed-uses-mysql for an example. MongoDB is more conveni

Yup. See http://bret.appspot.com/entry/how-friendfeed-uses-mysql http://bret.appspot.com/entry/how-friendfeed-uses-mysql for an example. MongoDB is more convenient to program because it's all built-in.