Marco Arment's sold Instapaper (at least most of his interest in it). It appears, however, he didn't pull this off by finding the biggest company willing to write a check with the largest number of zeros but instead sought out a company, in this case betaworks, willing to shower love on Instapaper as he did.
I sure hope there is some anal-retentive person at betaworks willing to sweat the details like Marco does. I've been using Instapaper since it was just a web service. With the arrival of the iPad, my infatuation turned into love and Instapaper still is one of the most used apps on my iPad.
I get overcommitment and I can't wait to see what Marco creates next. I wish him luck but I doubt he needs it.