Here are links to various cheatsheets:
http://www.webappers.com/2008/11/05/best-cheat-sheets-for-web-developers/
http://pushingbuttons.net/cheat/
http://www.addedbytes.com/cheat-sheets/
http://cakephp.org/files/cakesheet.pdf
http://www.serversidemagazine.com/cheat-sheets/PHP5/
http://techcheatsheets.com/
