I see all of these nice pics on here and it's left me one thing.... how in the name big grey and furry did you post this crap? i have pics from a few drifts that my mate who is on his PS3 like all the time and i did that i'd love to post here!
Yeah, if you go into your gallery and hit options on the picture, there's an "Export to XMB" option, which always says you need 500 megs of hdd available. I think that's just for the initial setup, as obviously each pic doesn't take 500 megs...
Once it's exported, you can view it from outside the game in the Photo section of the XMB just like any other photo you've put on your PS3. Then from there you can copy to SD/USB and do what you like with it. They export as JPG's.