Just signed into PayPal to transfer some money, and they're busy pushing a new PayPal.me link. It seems this might be an excellent way to sell books independently of the big chains (Amazon, lulu, smashwords, etc.). When someone you meet on the street asks about your book, you just email them a link (including the dollar amount and currency), they can approve it right then, and the transfer is complete. It's also a handy way for people to order special formats your outlet doesn't offer.
Of course, the limits are the people you're selling to have to have their own PayPal account, but it's available in most countries (Yes, Ernest, even in Australia).
Commercial account sound pricey (2.9% + $0.30 for each transaction) but it seems like a viable alternative--especially if you'd rather not cope with Amazon.
Has anyone tried it yet? If so, have you encountered any troubles with it, and how have you implemented it, if you provide the service on your website?