I saw this at the bottom of Vercingtorix's linked article:
[quote]Bogus or not bogus?: Say it isn't so, Sony! No? OK, how 'bout you, Pachter? "The rumor about Sony limiting the resale of used games sounds phony to me," said the analyst.[/quote]
Anyways, I don't think it could even be technically illegal to buy and sell used games. The producer (in this case Sony) has already recieved their cut on that unit; what's done with it afterwards is none of their business. The intellectual property is still owned by Sony (copyright laws) but the physical property is the legal property of the consumer.