it is possible someone snatched it out of my pocket. my roommates both deny having seen it, and they both have iPhones so I don't see why they would take my iPod touch (which is basically a cheap iPhone minus the phone).

I am marginally holding out hope that it will turn up when I move in a month. I got home from the airport at around midnight and was very tired, so it is possible I took it out of my pocket and stuck it in some random place I never would think to look.