The phone vibration seems to work on this same principle, giving it much less of the typical buzz (in the funky, cheap sense) you expect.

ENGADGET: Motorola Droid X first (official) hands-on and unboxing! Update: video!

These calculators are typical of the one-machine-one-job principle on which office mechanisation has so far proceeded, and it is a principle that some consider totally unsuited to electronic techniques.

ECONOMIST: The business world