I hope you didn't miss it (EDIT: you have until July 3rd, then the program is gone), but after Sony's horrible Playstation Network was down for a MONTH, they offered a "welcome back" program:

LINK

So, that 1st weekend they were back up, they offered 2 free rentals form their video store (you could rent for 2 days shit like Bad Boys and Ghostbusters. Movies you can watch free on Netflix and a bunch of other places.) They also gave a free month of their PSN+ service which from what I can tell only gave you some exclusive demos and really really bad indie games for free (which won't work after the free month passed.) You could also pick 2 free games for life from the following list:

Little Big Planet 1
Wipeout
Dead Nation (top down left4dead/smashtv kinda game)
Infamous 1
Superstardust HD

So just follow directions in that link and hopefully it still works. It was an option in the PSN Store that says 'WELCOME BACK' or something.