Whether you need a poster to use for a presentation or a cheat card to keep by your monitor, TechPosters has a sizable archive of posters, diagrams, reference charts, and cheat sheets.
The hundreds of entries at TechPosters span dozens of categories including everything from Access to XML and everything in between. Need keyboard shortcuts for Indesign? A visual representation of the Linux kernel? You'll find it at TechPosters.
If you find a particularly interesting document out of the bunch make sure to share a link to it in the comments below. Have your own favourite resource for cheat sheets and technical posters? Sound off in the comments.