If you want your very own big, strapping sackboy viking, head over to this link and get your own code to download LittleBigPlanet's Norse Mythology pack. That's it! No other hoop jumping or invasive corporate shenanigans required. It looks like you need a US PSN account to get it to work, but there may be work-arounds for gamers in other countries. Also, some folks are reporting that it may take a couple of tries to get a code that works. If you can't get the code to regenerate, try another browser to get another code.
The game's been out a year, so I'm not sure how many of you are still firing it up on a regular basis, but free's free. I'll be interested to see if the PSP version of the game gets similar support from Sony and the developers after it comes out, as I'm sure they're hoping that the title pushes the PSPgo (and the older models as well) into a lot of sweaty palms when it comes out this fall.