When I fill out a web form, I like to navigate through the fields with the tab-key. This works well in Windows and always has. A few years back, though, I made the transition to a mac. It works great for most things; I especially love the ability to use multiple desktops. Unfortunately, I can't navigate through the web form fields using the tab key because radial buttons get skipped. At least in default settings. There's a way to enable tabbing through all fields of web forms. You also have to tab through some extra links while filling out web forms, but I think it's worth the extra effort. The configuration is called "All controls" and you get to it through the System Preferences.

Go to System Preferences -> Keyboard menu -> Keyboard Shortcuts tab. At the bottom of the window, there's a radial button called "All controls". Select that one instead of the "Text boxes and lists only" like in the screenshot.