Good news to those of you worrying, possibly unlike the next xbox, the PS4 will play used games. No doubt this make gamestop and those who buy used games feel a lot better.
If new games are expensive, used games will only be a few dollars cheaper at Gamestop, EbWorld, and online.
I read on blogs that players can stream older PS1, PS2, and PS3 games if you have a fast enough internet for streaming games. I wonder if people bought older versions of games can use their disc to prove they own the game to stream it without re-paying to stream the game.