According to DC Comics, beyond the baby and the blankets that were destined to make up Superman's future uniform, what else did Pa Kent salvage from baby Kal-El's spaceship?
Canonically, various items were removed from the pod found by Pa Kent;
In addition to the swaddling robes he also used the seatbelt, rubber lining from the seating, etc. to make superman's "super suit"
Obviously (as with most DC comics) this differs depending on which origin story you choose. In several stories his glasses are made out of Kryptonian crystal which is described as having a hypnotic effect...
In the Christopher Reeves films (as well as the newest 'Smallville' series), he also finds a set of "knowledge crystals" that contain kryptonian teachings as well as the ability to create a 'fortress of solitude' from solid ice.