Interesting radio related websites

There are lots of useful websites out in web land. Here's a few:

• www.bandplans.com - Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy (like SSTV), etc? This site will be the database for the following: 1) known net frequencies, 2) known segments for different modes, 3) known beacons
• www.g4nsj.co.uk - Ray G4NSJ's site - quite a lot of useful information and some humorous stuff too.
• hfradio.org.uk/index.html - G4UCJ's website - Digital modes with screenshots and sound files useful if you want to visualize digital reception