I didn't bother with gold on NASCAR - Jeff Gordon is a knob
I just about managed 5th in the final race, and i mean JUST!!!
You need to save the pics to the PS3 HD, which you do by going into your photo album and clicking on the pics you want. The click on the icon labelled "transfer to XMB folder" i think, which will save it to your hard drive
This will then make a folder in "pictures" on the PS3 home screen, so you plug in a USB stick to the PS3 and transfer them into that
Long winded, but well worth it
If you wanna take pics on the track (all i've done yet, haven't bothered with photoshoots) you need to watch the replay (which you can't FF or anything which is a bit gay) and then press the start (pause) button to go into photo mode