When a client calls up and asks to increase the icon size by 20% or tweak colour values and shadows, it’s a breeze to make changes in the stylesheet directly. I've made a demo with 16 different ways you can creatively use font icons in your next project.

If you’re using CSS3 properties for graceful degradation, it’s probably fine to drop vendor-prefix support for certain properties. It’s best to educate clients about future maintenance woes and why it’s absolutely fine if Firefox 3.6 users will see square corners and no shadows, as long as you’re not breaking the site's layout.