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As simple a tool as this may seem, the CSS Cheat Sheet V2 on the Added Bytes website is very a useful tool. The handy cheat sheet is available in PDF or PNG file formats and can be downloaded for free; however, the author Dave Child does ask that folks donate to his Amazon.com wish list! Included in the cheat sheet are selectors, pseudo-selectors, units, box model, and properties list. The site also offers the cheat sheet in Spanish, Portuguese, and Russian language versions, and in Apple dashboard widget and iPod content formats.
Dave also offers cheat sheets on other web development topics such as Python, Subversion, mod_rewrite, PHP, SQL Server, HTML, and others.