Maybe a courier network to ferry packages around is a good idea.
People order something and the package goes through several hops between the sender and the receiver with the couriers using encrypted messaging to receive address details.
Think of onion routing but in a physical sense .
Maybe P2P in a physical sense? e.g. send the package to any other peer in the community, and if that peer is the final peer destined to receive the package, they can keep it, otherwise they should update a kind of status and send it out again. ^_^
ronaldmaustin's post about banned items on eBay is a great place to start thinking about what else could be sold there.
Suggestions:
Alli,
military items/instruments, information, manuals, weapons, vehicles, armor/uniforms,
firearms, weapons and knives,
offensive material,
replicas, counterfeit items, unauthorized copies of items: handbags, mobile devices, bootlegs, sunglasses, wallets, watches, fake autographs, pirated movies, videos, music, photos, software, video games,
alcohol,
animals and wildlife products,
art,
artifacts,
catalytic converters and test pipes,
cell phone service contracts,
contracts,
used cosmetics,
counterfeit currency and stamps,
stamps,
credit cards,
electronic surveillance equipment,
embargoed goods,
event tickets,
government documents, IDs, and licenses,
hazardous materials,
human parts and remains,
items encouraging illegal activity,
lockpicking devices,
lottery tickets,
mailing lists and personal information,
coupons,
medical devices,
pesticides,
plants and seeds,
police related items,
political memorabilia,
postage meters,
real estate,
recalled items,
slot machines,
stocks & other securities,
stolen property and property with removed serial numbers,
tobacco