A hand-held electronic device with a keyboard optimized for use with the thumbs is disclosed. In order to operate within the limited space available on a hand-held electronic device, the present invention optimizes the placement and shape of the keys, preferably using keys that are oval or oblong in...http://www.google.de/patents/US7227536?utm_source=gb-gplus-sharePatent US7227536 - Hand-held electronic device with a keyboard optimized for use with the thumbs
