Greg Newman has cheat sheets for Aperture and Lightroom on his site. His screen shots take you to Flickr, so don't go there.

What you really need is to look for the links under the images and download the ZIP files, two for Lightroom (Mac and Windows) and one for Aperture. After unzipping you'll find a large PNG image for on-screen use and a PDF for printing.

Tags: Aperture, Lightroom, Cheat Sheets, Tips And Tricks