With a Web and iPhone app, I try to find new and tiny ways to delight my customers. They may not notice, but it helps drive goodwill and makes your product remarkable.

With Instapaper, I can take a few months off. I can't stop publishing 'The Magazine' for two months and work on something else.

I've worked with many large and small publishers, and nearly all of them love the value that Instapaper provides to their readers.

Apple already had everyone's billing information from iTunes... you could buy things just by typing in your password... That, for the first time, brought very, very easy payment to the modern software world. That, more than anything, is why there is a business for paid apps.

I started out from a pretty modest background, so I always had a pretty good sense of money. I always had to work for my money, save my own money, I always bought my own stuff with my money... trying not to waste money unnecessarily.

I don't need every customer. I'm primarily in the business of selling a product for money. How much effort do I really want to devote to satisfying people who are unable or extremely unlikely to pay for anything?

Making a product better often requires removing features.