You can also use Gumroad :
http://www.gumroad.comGumroad doesn't charge much, and you can sell whatever you want. There is also an option to send http post to your web server with purchase information such as customer's email and price. It also allow you to setup a price as 'pay whatever you want' with a minimum of your choice.
Gumroad also save all of the customer emails for you, so you could also use that to send out your game later as well.
It doesn't accept paypal though. Credit card only. Although you get paid via paypal.
This actually looks pretty fantastic as far as terms. One thing we're liking about FastSpring is that they actually build a custom store page styled to our website, so from a customer point of view it never feels like they've left Flippfly.com...
I'll definitely keep this on in mind though!