Provided it is free for the cost of postage then it's ok, although is alot of hassle for the person offering the stuff. My PO and charity shop are within the same walking distance but thought i'd offer Toms old clothes on here first.
I don't know why the swaps just don't go in with the rest of for sale/wanted. It's annoying when it's posted in Champs Mumsnet swaps bit.
Picturetrail just saves me having to fanjo fanny around e-mailing pictures especially as hotmail can be soo slow!