Your "old" Airport Extreme (at least the one you linked to) can also share data from any USB device connected to it - without needing a computer (well other than for initial setup).

You can set permissions on a USB drive (or thumbdrive) so that everything is read only and then basically share the drive. Pretty easy to do in the Airport Setup utility. You can also create what are essentially write only drop boxes for people to provide info that you can review and make public as you see fit.

Good idea but any wifi based system will be somewhat range limited unless your neighbors decide to extend your network with their wireless routers.

- Eric