By default, on a mac keyboard F3 lets you see all the open apps and the such. However, I changed it so that I use those keys for keyboard shortcuts; But i'd like the normal F3 key to still work without me having to press FN.

rajlego,

in the Keyboard pane of System Preferences, select the Shortcuts tab, and then select Mission Control on the left-hand side. On the right-hand side, make sure that the Mission Control checkbox is checked, double-click on its current key combination (by default “^↑”) so that the key combination is highlighted, and then press the F3 button — that will set its shortcut to be F3. You can now press F3 to bring up Mission Control without needing to also press the Fn button.

Thanks, two and a half years later!

I have a new Macally keyboard and the F3 key defaulted to the "Copy" function.