Has anyone else realized that if you are on speakerphone and then end the call without turning it off, the next time you make a call and want to activate speakerphone, the icon in the upper-left shows speakerphone but it is not in fact on. In fact the option when pushing in the track-wheel says "Activate Handset," so to turn speakerphone on you must first "Activate Handset" and then "Activate Speakerphone."
(Of course you could just hit {OP} twice.}