Real world demo of Siri on iPhone 4S.

Impressive. Much more effective and delightful in action than I thought it’d be. Siri is (or rather has the potential to be) the iPad of general purpose, knowledge based A.I. companions: an age old, long sought after idea, executed well enough to make it go mainstream. Microsoft’s powerful tellme service and Google’s voice search (to a lesser extent) will only help that cause.