One of the themes of this blog is how I make money selling my own Mac apps on my website rather than through the Mac App Store. I truly believe it's the best way to go if you're serious about earning a living. That said, not everyone has time to write their own backend sales platform like I did. For those who want to focus on development and make the actual sales process as painless as possible, I recommend using FastSpring. I've used them since 2009 and have never been disappointed. And getting up to speed with FastSpring couldn't be easier than this great new book by Christian Tietze. It's all about how to sell your apps outside the App Store. It covers everything from how to setup a storefront, to implementing serial numbers, and protecting your app against piracy. I've read the book, and it's great.
If you do like the book and decide to buy, using this link will give me a small kickback. (But that hasn't influenced my decision to post about it. The book really is good!)