Have a look at this forum post discussing Etsy. It has regular updates on the site including traffic and sales.Link hidden: Login to view
You may also read our Blog Entry on Etsy:Link hidden: Login to view
Nothing beats eBay's traffic but Etsy is more of a specialty site targeting a particular niche market so I'd say, it would be good to list both on Etsy and on eBay.
All the best,