Someone you love going on a thruhike? Don't know what to get them? Here are some ideas.
$14 Long handled titanium spoon http://www.antigravitygear.com/vargo-titanium-long-handle-spoon.html (the plastic ones don't hold up). Good for getting down into ziplock dinners without getting your hands all nasty.
$45 Petzl Zipka Plus Headlamp - plenty bright, plus red light for at night so you don't blind everybody. http://www.rei.com/product/793268
$18 Swiss Army knife. Use the knife to slice cheese. Use the scissors for everything else. http://www.rei.com/product/403028
~$6 No link, but go to Walmart. Go into the garage/car section. Buy a 50' length of lightweight nylon utility cord, in a bright color like red or yellow. It should be about 1/8 to 1/4 inch diameter. It makes an excellent bearbag line. It's bulky but lightweight and doesn't tangle or mildew. Should have a weight strength of 75 lb or so.
$27 Mountain Hardwear Power Stretch Gloves. Comfy, washable, easy to get in and out of. http://www.amazon.com/Mountain-Hardwear-Power-Stretch-om2860/dp/B001E5PKQY/ref=pd_sbs_a_2
$8 to $13 (or free if you have Reflectix to make it yourself) A pot cozy. Keeps the contents of the pot hot after you cook. Can be used to continue cooking your food after your stove burns out. Technically doesn't fit in a stocking, but.. http://www.antigravitygear.com/antigravitygear-pot-cozy.html
$12 An alcohol stove. This one is nice because you can sit your pot right on it.
$3 Mosquito headnet. Nearly weightless, and invaluable when the gnats are bad. Which is often. http://www.antigravitygear.com/mosquito-head-net.html
$20 A Buff. It's kind of like a bandana, kind of like a neckwarmer, and useful for many things. http://www.amazon.com/Buff-Original-Color-Pink-Print/dp/B003ZTPIVE/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1292181132&sr=1-1
$4 A plain old cotton bandana or three. Very, very useful. The swiss army knife of clothing. http://www.rei.com/product/246097
Variable price. Check out Minimus.biz for single servings of almost everything. Shampoo, coffee, and most importantly food. Wouldn't some hummus taste great on the trail? http://www.minimus.biz/