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Redistributing from Capital to Workers: An Impossibility Theorem" is a fine post by Garrett Jones on Econlog, explaining the theorem that the optimal tax on capital is zero. It's the best blog-post length, evenhanded, accessible summary I've seen. It includes all sorts of links where you can see arguments in detail, an unusually scholarly approach for a blog post.
His one-sentence summary
Under standard, pretty flexible assumptions, it's impossible to tax capitalists, give the money to workers, and raise the total long-run income of workers. Not, hard, not inefficient, not socially wasteful, not immoral: Impossible.
