This would be more interesting if any of their principles defied conventional wisdom. As it is, it's no different from those "honesty, compassion, efficiency" company mission statements. Also, as I read it, I keep picturing the Google Mail inbox browse.
I'm not sure what makes these principles 'conventional'. They're rarely expressed so succinctly, and even more rarely put into practice. Also, this document is specific to web design, not generic corporate philosophy, and gives more practical direction than a typical corporate mission statement.
whats so unconventional about Google's rules, is they apply them instead of just having them.