Amateur Radio

Overview:
I have an interest in Amateur Radio and here is a list of some interesting sites.

Amateur Radio:
Amsat - Amateur Satellites!
The Extraordinary History of Amateur Radio Satellites

GMRS & FRS (US):
GMRS (General Mobile Radio Service)
FRS (Family Radio Service)
FAQ

PMR446 (UK):
PMR446 - European standard equivalent to FRS in the US
446user - Includes lots of information and software to set up 446 gateways!

CTCSS - continuous tone-coded squelch system (privacy channels) explained