purse size perfumes, a mag subscription(it usually has an attached card you can give to a friend), travel size make up brushes, bejeweled hair pins from claires , the receiver's fave candy/mints/gum...cute earphones, cute keychains...
Ugh - I hate stocking stuffers!! I always end up spending 100+ on stocking stuff!!
Handheld electronic games like soduko
little picture frames
whistle (good for women/girls to have just in case)
stockings are huge for me and my sister and i were just talking about this today (now that she has munchkins) - a few generic non-specific suggestions... fun little things (silly string, confetti blowers, silly putty), books, christmas ornaments, lip glosses/nail polishes, walkie talkies split between two stockings (makes for a fun day), dvds