Also, I did't read it before, but Vestcoat is spot on. You have to have the balls to do it, and accept that sometimes you're gonna get f*ck all. I've sold a wireless router for 99p, which is crazy good value, but in the end, I wasn't using it, so I'm actually 99p better off.
On the other hand, when I sold all my Lego, I got about £300 if I remember, by starting at 99p, ending on a Sunday, and letting the right people know it was for sale. I have a whole box of stuff I want to get rid of, but I always have better stuff to do on Sunday than eBay.