I might as well get fancy with my eBay pictures:
I sold a bunch of old photography stuff on eBay and figured I should put at least a little effort into making it all look nice, since I'm a photographer and all. I did little processing, and no touch-ups. Rather, I just set up a simple light box and two flashes (that might be the hard part for most people). The light box was a super cheap translucent storage box from Ikea that I use to hold some photography stuff between jobs. I should really post something about the set up one of these days. It's really easy; almost foolproof, in fact, once the exposure is dialed in.