Interesting. I didn't even know what that was. Did some quick searching and that is a good feature. Has anyone had any success with it? From what I read, you have to actually log in with a local account on that users machine? Which I guess if they aren't local, you could just give that person your info? If anyone wants to work out something with this, I would be more then happy to!! There are some games I was interested in checking out, but may not want to purchase (sky diving, calling all cars, etc...)
I have a three-friend circle who share basically all our content. We each have a local account on the other's machine, but even then it's just so we don't have to change the other guy's PSN login settings to grab new content. So far this has worked on anything and everything just fine, from Tekken online to Rock Band songs. After you have the content downloaded locally, it doesn't matter what account you're logged into or whether you're online or not... it just works. And, nicely, if you're playing games like Super Stardust HD, whatever PSN login you happen to be on at the time will be used for high score lists and the like; it's not limited to the game owner. The only game I know of which works differently right now is Warhawk, as it's tied to your login; you can still install it on multiple machines, but a friend would have to be signed on to your PSN to play online.
I sometimes stretch a fourth code to my brother, but figure keeping at least one "charge" free makes practical sense in case I have an issue with my hard drive at some point, or want to upgrade. Technically you're supposed to be able to be able to have your content registered on five machines, but I don't believe they're set up to handle it like iTunes (where you can reset permitted machines periodically), but rather simply have a "download limit" right now. One could probably argue the case with tech support (you've shared a game with four other machines, but then--say--have to get yours replaced by warranty) to be able to download them again, but I'd rather avoid the potential headache. Obviously I haven't tested the full parameters of this yet.
But at any rate, it's awfully nice to get so much with no effort. ^_^ My friends and I try to split things up as best we can, but even if all you do is share what you'd pick up all on your own, a group of friends will probably end up with enough differing taste to be able to try out a lot more than you would otherwise.
Also, just as obviously, there's a decent level of trust that has to go on here. The "less secure but more convenient" method is to toss them your PSN username and password, at which point all you have to do is let them know they can grab a new game or DLC you picked up. More secure but less convenient is if you have periodic local access to their machine, at which point you can just have a username on it, occasionally log onto your account, download the content yourself, then log out without saving your password. (If you trust them enough but are worried about your CC being used, you can always keep your password to yourself, log in once and save the PW, but put a pass-lock on purchases. Or alternatively change your PW to something generic, call them and tell them to pick up the content, then change your PW back after it's done.)
They could really use a cleaner and safer process for all this (say, tossing a "download permission" through your friend's list and letting them do it themselves, or at the VERY least making a cleaner separation between paid/protected and free DLC in your Transaction History so that demos and videos and such don't bog it down), but I think they like having the positive reputation of HAVING the capability, without losing the revenue (or gaining comparative ire of the devs/pubs selling their wares) that they might if they called more attention to it, and made it easy to take advantage of.
If you're a nerd with friends, however, you can save quite a bit. ^_^ And even if you ever run out of "charges" and don't want to deal with the hassle of going through tech support, it just turns into someone else buying the content again, and having more "charges" set up. Even if you're just sharing with two others, you're still well ahead of the time if it does come to that.
Well except for the "I want it now" bit, I don't mind waiting a little while, almost done with the new kitchen but not quite yet. 
