A quick reference guide for regular expressions (regex), including symbols, ranges, grouping, assertions and some sample patterns to get you started.
A mod_rewrite Cheat Sheet - a quick reference guide for mod_rewrite, with rewrite flags, regular expression syntax and sample rules.
A quick reference guide for PHP, with functions references, a regular expression syntax guide and a reference for PHP's date formating functions.
A quick reference for HAML. See more information about HAML here: http://haml-lang.com/docs/yardoc/file.HAML_REFERENCE.html
Python cheat sheet
A cheat sheet for the MySQL database.
Subversion cheat sheet
List of common jQuery selectors. I had compiled this list a while ago into a word document but do not remember the source now.
Cheat Sheet for the Mercurial distributed source version control management tool. System.http://mercurial.selenic.com/
CoffeeScript cheat sheet compiled after following "CoffeeScript Koans" from sleepyfox
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