OK, most of us have piggybacked on an open wireless network, but what about consensual/legal piggybacking? My friend lives in an apartment, with a secure password protected wireless network of his own. A neighbour upstairs who doesn't want to pay for a phone line to get ADSL has approached him asking to be able to connect to his network permanently, in return for paying part of his monthly net costs. He thinks this is a bit odd. How widespread is this i.e. people in apartment blocks agreeing to let neighbours use their own wireless networks?