Demos on the PSN

Is there by a chance a site, list, etc. that reveals when demos of upcoming games are being put on the PSN for download? With so many potential good games coming I'm not too sure of which to get and a demo usually gives you a pretty good idea/feel for the game.

it's gonna take more than 40 seconds to find out when the upcoming demos are coming out on the store, since the OP was asking about UPCOMING demos. The GS and IGN ideas are good though, usually for a big release game one of those sites will tell you in advance about a demo. Might be worthwhile to check out the developers' websites as well to see if there's a demo planned.