...and since there is no MP 05, only MP 04, and since S&T 05 added several GPS related features, S&T is now more attractive for most GPS related uses than MP. Still though, MP is programmatically controllable and accepts plug-ins (AGPS comes to mind
http://www.techgt.com/AGPS/ ). S&T is not programmatically controllable.
EDIT: Nice write up Bugbyte. It should be made into a
STiCKY.