By John Gruber
Square Reader SDK lets you use Square hardware to take payments in your app.
It’s always fun when a thoughtful usability critic switches from Mac OS 9 to OS X, and Thomas is no exception. His initial reaction: “My first 48 hours enduring Mac OS X”.
Out of his 48 points, I disagree with one and a half — all of #28, and the parenthetical aside in #3.
Recommended reading, even if you wind up disagreeing with more than 1.5 of his criticisms.