We recently had the opportunity to revisit the Cooke Orthodontics site we launched in March, 2010. Ethan Marcotte was still a couple months away from publishing his first article about responsive web design in A List Apart at that point, so not at all surprisingly, the site was built with a fixed-width, centered layout. Dr. Cooke and her team were recently seeing a noticeable increase in non-desktop visitors to the site and asked if we could make that experience a little better. We agreed, of course, because we like good, device-agnostic web experiences as much as the next geek, but also because taking an existing design and retrofitting it to work across devices and screen sizes poses a number of interesting and fun challenges. (Well, what we call fun around here, anyway.)