Yes. You'll need an antenna to go with it. I use this one: "Antenna RP-SMA +3dBi 5cm"

I'd upload a picture, but for some reason the forum software isn't letting me. The Pi no longer fits in the standard case, so it would need some alternative enclosure (I'm thinking of using a margarine tub and just hiding the whole lot away somewhere!) or some modifications to the standard case.