Late reply here as I haven't been watching the forums as much as I used to.  Here's my biggest question / concern: given the huge volatility of bitcoin, if I use your site, I'd prefer to have the price of my books pegged to the US Dollar so that someone paying the equivalent of $10 (for example) one day wouldn't be paying $100 for the same product a month later.  Do you have any automatic ways of doing that?