I am the shuffling through paradise blog on this site. They are very low res here but those photo's were mostly taken with a Fuji Coolpix digital. They are good enough quality to blow up to 8 1/2 by 11 and frame when they haven't been compressed during uploadin. I also got decent pix with disposable camera's. The rite aid right by the finish line used to sell a disposable digital so you had a preview.
My Fuji, fit nicely in a sandwich bag, that fit into the pockets on Race Ready shorts (my favorite brand) The disposables were more of a hassle. They'll fit in a baggy but they are bulky. On year I safety pinned the bag to my shirt at my waistband-- worked ok.
Just make sure you don't get sweat on the lens.
Enjoy the race. its really beautiful.
