Mike's list of recommended "Ham Radio" sites:
Amateur Radio on the International Space Station (official ARISS site)
Amateur Radio RF Safety Calculator
Automatic Position Reporting System
BAMA (BoatAnchor Manual Archive)
Connecticut Spectrum Management Association
DX QSL Routes (via Pathfinder-DxLab)
Frequency Allocation Chart (the US Radio Spectrum from 3KHz to 300 GHz in Adobe ".pdf" format)
New England Repeater Directory
RidPix Database (pictures of most rigs new & old!)
Translator (translate from/to English to/from several languages!)
Understanding Soundcard Interfacing (WM2U's excellent article on interfacing)