The important thing about this one is that its Insert/etc. and arrow keys are in the proper arrangement: Insert/Home/PageUp on the top row, Delete/End/PageDown on the bottom row, and arrow keys in an inverted T. I refuse to use keyboards that don't do this.
(An unopened Natural 4000 is currently sitting behind me; I'll upgrade when my Natural Pro wears out.)
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: