We go through all the new pictures periodically and set whether a picture can be chosen or not. Basically, if it's a picture of a truck it's going to go in the pile.
Merrick - if they were just in order that would mean that right now it would be almost 2 years before a photo put in the readers rigs today would show up there! Hummin Cummins has 5 pictures that could show up - it's coincedence that he came up two days in a row. Someone complained in the past about their truck not showing up and I think it came up the very next day. Right now there are close to 600 pictures in the queue.