Arguably improving form but definitely not function, Oligo ($29.95) is a basic browser with advanced skin options. The interface is unintuitive: Oligo's few buttons have unhelpful icons. To get to a menu, you click on the button you'd think would maximize the window.

With Oligo, you can customize various behaviors for sites. You choose a skin—as well as a font type and a background color—and it will display when a given site loads.