Been thinking about buying this Matias Mini Tactile Pro keyboard specific keyboard for my Mac. It's small, it's wireless, it has a USB hub, and it closely mimics the feel of the Apple Extended Keyboard which most Mac users regard as the best Apple keyboard ever made (honestly, I don't know if that's saying much).
Expensive, but I guess I'll give it a test drive. I've been writing a lot more lately anyway so this might prove to be a worthwhile investment.