[warnergt]

I have a Mac Mini G4. It was purchased without the wireless option. What does it take to add it?

[hemant]

You can get a USB wifi adapter.

[ghporter]

It's not all that difficult to add the AirPort card to a Mini. While it's a little tricky getting the case apart, once you do, it's straightforward. You need more than just the card though-it requires an "inbetween" board called a "mezanine board."

Read here for some pretty straightforward and well illustrated instructions.