VIM quick reference
The Vim commands cheat sheet
Ruby QuickRef
Configuring Rails Environments
cheat sheat containing config options for rails
GitCheatSheet - GitWiki
R Reference Card
$ cheat git
Vim Links of Worth and Valor
great vim resources page
Vim Eye for the Rails Guy - Cheatsheet
Computer hardware poster 1.7 by ~Sonic840 on deviantART
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ffmpeg Cheat Sheet - 19 Best Practices [Linux] ~ Web Upd8
Ultimate IE6 Cheatsheet: How To Fix 25+ Internet Explorer 6 Bugs
Approach Excellence... Reality?: RSpec 2.0 cheat sheet by example
dayid's screen and tmux cheat sheet