
Kevin Kelly has a great round up of crystal radio builds, free plans and kits (some I haven't seen either) - Link.
Inspired related round up:

HOW TO - Building a crystal radio out of household items - Link.

Refugee Radio - An energy-independent AM-receiver radio... - Link.

Building a radio in 10 minutes - Link.

Crystal radio mousetrap - Link.

Crystal Radio Kit for the Modern Era - Link.

Make a "Cigar Box" crystal radio set - Link.

HOW TO - Make a simple AM radio - Link.
From the pages of MAKE:

DIY Aircraft Band Receiver. Modify an AM/FM radio to pick up air traffic control communications. MAKE 09 - Page 27. Subscribers--read this article now in your digital edition.

TV Set Salvage. Nothing good on TV? Well, there's plenty of good stuff in a TV. MAKE 09 - Page 138. Subscribers--read this article now in your digital edition.





































The mouse-trap one is particularly great. Good show!
Reply to this comment
Very nice. Mine is very ugly, but it works -- it pulls in Radio Kismat in London.
Check it out, complete with an audio clip (scroll down to December 16): http://www.gadgeteer.us/GADGETEERNEWS.html
Reply to this comment