Want to listen to Short Wave real time ?? try this R-8 Receiver
Broadcastify - Listen Live to Police, Fire, EMS, Aviation, and Rail Audio Feeds
misc scanners on the net

Listen to SDR Receivers worldwide
Another SDR Radio
WebSDR is the place for a lot of SDR radios that can be monitored Via the web

A good web page describe the 4 Ways of Repeater linking
IRLP InterNet Relay Linking Project
eQSO allow licenced amateur Radios connecting radio to the Net
EchoLink also do the same for Licenced amateur radios

Free Radio Network also do the same but free for all

DC to 1GHz remote controlled Radio