Courtesy of ABC News:
Astronauts can bring iPods on the Shuttle, but not onto the International Space Station.
Since money has no value in space, astronauts have been known to hoard their rations of M&Ms and their dehydrated meals to use as bargaining chips. Also, M&Ms, coffee, and tortillas have the highest value.
NASA has engineered special silver-lined clothing that absorbs odors since you can’t do laundry in space. They then recycle the clothes for other missions (including underwear).
For more little tidbits, find the full article here.