Somebody will back me up on this, but I had the (pretty obvious) idea of PodGuides (via EirePreneur) about a year and a half ago. In fact, Todd can back me up, because we had a brief email chat about the idea with Larry in July, 2003.
My idea was a user-generated site of MP3 city tours from around the world. People would record them, send in the raw tour, we’d edit it, clean it up and sell them for $8-10 a pop. I actually got pretty close to starting it–I even picked an available URL (the funnest part of any business venture): wandertown.com.
These crazy Dutchmen Belgians are giving this stuff away for free:
All podguides are for free! Yes, you’re reading this correctly, you can download these guides for absolutely no fee at all. Why? Well, honestly, we didn’t have enough resources to make a descent online store. Securing the files against piracy is practically impossible. Everyone would have been able to copy them as many times as they wanted. So why bother.
Why bother? For the cold, hard cash, of course. Building an online store isn’t that difficult (I looked into Audible, but they’ve got the nasty DRM), and I wouldn’t have worried about DRM at all. Better to sell 100 copies and have 10000 copies floating around than only sell 10 because of DRM.
If they want to give this content away for free, good on them. Still, I think there’s a micro-business model there, particularly given the emergence of podcasting.
DarrenBarefoot.com 
Oops… stepped on your toes did we? Trust me, you’re not the first one with these feelings. There was even someone who bought podguides.com with exactly the same idea. Never put a thing on line after seeing the site. A shame really.
It’s true that there’s a nice ‘micro-business model’ to be made out of PodGuides… But I am mainly focused on creating a PodGuide Community. Let people pay for it and… Gone community! A nice idea would be to leave the posted guides free, and make some professional guides that can be bought (don’t worry, I won’t)…
I’d feel bad for getting PodGuides for free, and selling them afterwards. Nevertheless… perhaps you should put your site up anyway? The more PodGuides, the better no?
Heh, no worries. I should’ve done it 18 months ago if I was keen on it. I’ll be curious to see if the idea has legs–I think the rise of podcasting will certainly help.
About the idea GPS + MP3 + Map = Tour Guide, please refer iPoint http://www.itravel-tech.com
It is pretty close to the idea. Maybe more than that.