Uneven Terrain: London Pirate Radio

Great short piece (video) on pirate radio in London

http://thepiratesdilemma.com/the-tao-of-pirates/uneven-terrain-london-pirate-radio

Open Frequency Finder

This handy little tool was designed for those people using in car iPod transmitters (totally legal) however, it's also a useful tool for finding open FM freqencies in your zip code.

http://radio-locator.com/cgi-bin/vacant

Just put in your zip and state and it gives you great/good/ok frequencies that are open in your area.