AMSAT-NA - Radio Amateur Satellite Corporation.
Amateur Satellite - N7RYW page
SAREX - Shuttle Amateur Radio EXperiment.
NASA SAREX - Shuttle Amateur Radio EXperiment
NASA Homepage - see Today@NASA for current space events.
NASA Online Educational Resources
SARA - The Society of Amateur Radio Astronomers
Satellite Tracking - online predictions.
SETI League - Search for ExtraTerrestrial Intelligence.