My general rule is everything goes to the kiddie resale shoppe (other mothers, or the like). When I say 'everything' that means, in good condition, no stains, rips, tears, all pcs-if its a set, etc. I have a continual rubbermaid bucket that I put things of DS in that no longer fit. Every month or so I make a trip and eventually the store will buy everything. It may take several months - up to 2 years- but they will take it, again as long as the items are not torn, stained etc. I also take toys, games, and things over there. THey do not pay well, about 25c-$1 an item but it means I dont have to have a yard sale and since I drive by the store weekly its not out of my way.
Last week they took about 20 pcs of boys clothing size 8-12 and I got $10 cash, of course if you take 'trade dollars' it would've been $20. but I only take cash, we do not need more 'stuff'.