CQ MAP?

Any one know how I could write a Gadgets, widgets or javascript to search twitter for #callingCQ and show anyones tweets with this tag. eventualy it could go on a map like http://uksnowmap.com/ or http://www.twitwx.co.uk/ had a look at their code but not sure about it can't get to bottom of it.

I suppose I could e-mail them?