Just posted a write up on my site that some may be interested in:
Experimenting with Colpitts Oscillators
http://makerf.com/posts/experimenting_with_colpitts_oscillatorsFor those of you who don't know, the Colpitts oscillator is a common RF oscillator circuit. Useful for when you don't have a crystal in the frequency range you want to use. The colpitts can be scaled for pretty much any frequency range based on the L and C values in the tank circuit.