Thanks for being so quick with your answers -- to clarify a bit --
I think I'm looking for a Journalist's Accreditation visa. According to entries on message boards found via a google search, I'd just have to have my media outlet write a letter saying I worked as a freelancer for them, send that letter and form to the US consulate in Madrid for verification (at least I think it's the US consulate -- entries just say consulate in Madrid), and then continue with the standard visa application process through my local consulate. Problem is I've found nothing on any official site saying this is possible.

I had originally thought the US embassy couldn't help me because it can't give opinions on other countries' laws, but now that I've re-read the google entries, I think it's the US consulate that OKs the journalist papers -- so maybe they can help.

I'm assuming I'll be able to submit the visa paperwork to the Spanish consulate here in Prague because this is where I'm legally living at the moment, but I'm not sure. I had thought there was another non-EU citizen on the board who had entered Spain from Prague -- I had thought she was Canadian from one of her posts -- but apparently she's an EU citizen, which makes a big difference when it comes to roaming around the EU.

If no one else ends up answering this post, I'll come back and post what I find out from the Spanish consulate here -- just in case there is ever another non-EU citizen living in Europe who is trying to relocate to another EU country without going back to their home country in between.