Ask Slashdot:Ergo Keyboards

Madsen submitted this as an Ask Slashdot, and its been weighing on my mind recently. I want a new keyboard- my wrists just aren't what they used to be after 16 hours of replying to flame mail. I'm curious what ergo keyboards people have tried. What ones they like. What ones will make my wrists last longer. And ideally, where I can find them and how much its gonna set me back.