With FunKeys installed, you can program all 15 of them to either open files/applications, execute AppleScripts, envoke macros (FKEYs), or even type text.
For example, F1 can open America On-Line, F2 can open Microsoft Word, F3 can turn off the sound, F4 can quit all open applications, and F5 can type "Sincererely yours." It's entirely up to you. FunKeys is incredibly easy to setup and use.
What's new in this version:
Can type text, open regular files.