Reference
Perl Cheat Sheethttp://juerd.nl/site.plp/perlcheat
Perl Cheat Sheet
http://ali.as/devel/cheatsheet.html
Perl Cheat Sheet
http://goldenink.com/perl/perlcheat.html
PHP Cheat Sheet
http://www.ilovejackdaniels.com/php/php-cheat-sheet/
JavaScript Cheat Sheet
http://www.ilovejackdaniels.com/javascript/javascript-cheat-sheet/
CSS Cheat Sheet
http://www.ilovejackdaniels.com/css/css-cheat-sheet/
mod_rewrite Cheat Sheet
http://www.ilovejackdaniels.com/cheat-sheets/mod_rewrite-cheat-sheet/
Vim Commands Cheat Sheet
http://bullium.com/support/vim.html
Cheat Sheet Roundup
http://www.petefreitag.com/item/455.cfm