Other than for very specific ergonomic uses, I honestly don't understand the appeal of a heavy mechanical keyboard; the old IBM buckling-spring Model M keyboard doesn't appeal to me at all. Personally, I do all my work on a ThinkPad keyboard, and I actually have a USB ThinkPad keyboard/mouse for use with non-laptop systems or docking stations. I like the short throw of the keys, I like keys close together (as long as my fingers have room to type, which they do on anything >11" or so), and I like having a mouse on home row.
You can tear my Model M from my cold dead hands. Ya, when I'm on a laptop, I use a chiclet keyboard like everyone else. But I can feel myself typing with the Model M, my finger energy is returned fairly efficiently on each keystroke, it just feels better for coding tasks.
I agree and use the ThinkPad USB keyboard on my desktop machines - they are great ergonomically, especially if you ditch your mouse. It seems like the USB interface is super cheapie though with lots of missed key presses, or an occasional stuck key. I'd pay a premium for the ThinkPad form factor with higher quality electronics.
