There are some people who can't learn to touch-type until they're forced to (by removing the labels, or other ham-fisted method). For those people, a das-keyboard or a can of spray paint will be a good investment, because their typing speed and accuracy will go up.
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: