TurboLT - I throw away really old, personal, or not useable items.
I donate things that aren't worth the time/effort to list (e.g. clothes, or things of very low value). I also donate highly needed items (e.g. my stockpile of toiletries - soaps, shampoo, conditioner, contact solution from hotels, couponing, etc.)
I try to sell higher value items, but if I can't after a couple of tries, I will donate too.
I also give away items as I come across things perfect for someone else.