Electronics Weekly:

GPS receiver fits into mobile phone sim card
by Melanie Reynolds
Thursday 10 May 2007
A UK-based start-up has announced a sim card for mobile devices which incorporates a GPS receiver and antenna, allowing location capability to be added to the device by just changing the sim card.
BlueSky Positioning said it has developed “patent-pending technology and processes [...]

From some site: (I don’t know where they got it from originally)
MapQuest Find MeՉ۪ Now Available for BlackBerry 7520
MapQuest Inc., Research In Motion (RIM) and Sprint today announced new group communication functionality for “MapQuest Find Me.” The GPS-enabled wireless service is now available on the BlackBerry 7520 Wireless Handheld, operating on the Nextel National Network.
“MapQuest [...]

GPS Receiver Manufacturers, System Integrators, Equipment Suppliers, and Service Providers
This listing is provided by the Canadian Space Geodesy Forum and the University of New Brunswick. by way of Richard B. Langley of Uni of Brunswick.

AACE Industries
Manufacturers of precision GPS and GLONASS receivers, temperature-stabalized antennas, and other equipment.

Aalto Technologies
Providers of GPS-based fleet management services. [...]