Links:

http://www.provide.net/~prsg/wi-gmrs.htm

The General Mobile Radio Service
A More Detailed Description

"Some "bubble pack" radios (so called because they are packaged in a
"blister pack") sold at consumer electronics stores are available for
even less, often combined with a capability to communicate on FRS
channels as well. (However, most such "bubble pack" radios are not
capable of transmitting on the GMRS 467 MHz frequencies, and are thus
not capable of communicating through conventional GMRS repeaters.)"

http://www.leeselect.com/uniden/frs_combos_flash.htm

Today's FRS radios may become more popular than CB's ever were.
These radios are the early revolution of the personal communicator.

FRS are older tech?
GMRS are new tech and greater range?