Prometheus has an amazing array of ways for you to keep in touch with what is going on in Low Power Radio- from twice a year updates to list-servs with up-to-the -minute information.

Prometheus De-Livered: goes out twice or three times per year, and it goes out to everyone we have ever met to keep them posted on what is happening in low power radio land. It is usually two pages long and gives the big picture, but not an information overload.
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Stubblefield: Stubblefield is a list-serv with a whole bunch of low power radio applicants and those that love them. There are a few engineers and attorneys there that like to help answer questions as they come up. Any actions on individual low power stations show up there once a day. Mostly it is designed for low power applicants to be able to talk to each other. For a listserv with as big a purpose as this, it is remarkably spam free and people are very responsible about not filling up your inbox with junk.
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If you're interested in helping with/giving advice to certain Prometheus technical projects, look here!

Geek Night!: This group works on cheap Studio Transmitter Link solutions for Low Power FM, among other interesting technical projects. The Philadelphia subsection of this group is meeting on Monday nights, testing out streaming audio over wireless Ethernet at long distances and setting up wireless Ethernet all over West Philadelphia!
To join the Geek Night listserv, click here.