I sent something to a woman last week who had sent me stamps and she sent me an e-mail saying thank you. Which made me nearly fall off my chair with shock - I realised that in 2 years of freecycling I've only once before had someone say thank you and that was for a computer that went to a charity. I'm not expecting their undying gratitude but is it too much to expect a quick e-mail acknowledging that they've got something for nothing?