Marco Arment, the creator of the popular read-it-later tool Instapaper, has an excellent blog post discussing copying, innovation, and the best ways to react to competition. Arment discusses a new Instapaper competitor called Readability, which launched last week and received a lot of praise for including custom fonts, something Instapaper lacks:I could have interpreted this defensively and complacently: “Georgia and Verdana are great, versatile, highly screen-readable fonts! I don’t need to do what competitors do! Newer isn’t always better! My crusty old fonts have some technical advantage that you don’t care about!” And so on. That would have just made me look stubborn and out of touch, failing to understand (in fact, trying very hard not to understand) why newer fonts could be attractive...