I found this a very helpful article. In particular the thing which scares me the most is always the thought of Having to deal with people's money, and so it is really nice to see someone talk about how they did it, and and how easy it was.
I've had FastSpring recommended by others as well and I am planning to use that service. Having dealt with accepting payment via PayPal I can only say: never again - they still owe me money, but I eventually gave up after I spent days trying to chase it down.
For what it's worth, I really recommend Stripe. It took me about two hours to write my home-built store using it, and I plan on using it on a new project soon.
I'm already signed up to be notified when it becomes available to use in Europe. Until it does, FastSpring certainly seems good enough (and defers the effort of setting up a non-static website to handle purchases, which is worth a fair bit to me as well).
