I saw a 4Gig USB memory stick for $3.95. That doesn't sound like much to me. Especially if someone can afford a PS3, GT5, and Internet Service, and a computer.
1. Take photo
2. Set photo to "Share with friends/online"
3. Go to Gran Turismo site and log-in.
4. Copy photos from your uploaded photos
5. Upload them to whatever hosting site you want.
On your photo, select share with friends. Log into gran-turismo.com, and your photo's will be in your account. Link the pics, or attach them to the thread.
*edit* GTPorsche beat me by 30 seconds. Good job, you win.