HTML/CSS
About the different options when using the all important ‘display’ property
http://www.quirksmode.org/css/display.html
All about HTML lists
http://www.cryer.co.uk/resources/javascript/html5_fun_with_bullets.htm
ASCII character codes
http://www.web-source.net/symbols.htm#.UNf3VrY5YlY
How to enable keyboard navigation on Mac browsers (for accessibility testing)
http://www.456bereastreet.com/archive/200906/enabling_keyboard_navigation_in_mac_os_x_web_browsers/
Developer Toolbar for IE6 and 7
http://www.microsoft.com/en-us/download/details.aspx?id=18359
Installing different versions of firefox
http://utilu.com/UtiluMFC/
Debugging on mobile ( Android / Chrome )
https://developer.chrome.com/devtools/docs/remote-debugging
Turn on HTML5 for IE8 and below
http://www.paulund.co.uk/turn-on-html5-in-ie8-or-lower
Converting text to code if you want to put an email address on a website
http://www.wbwip.com/wbw/emailencoder.html?regEmail=test%40test.com&codeEmail=
Design
Free Stock Images
http://www.sxc.hu/
Free Vector Images
http://www.vectortemplates.com/raster-maps.php
http://www.logotypes101.com/
Photoshop shortcuts
http://webdesignerwall.com/tutorials/photoshop-secret-shortcuts
http://firstsiteguide.com/adobe-photoshop-cheat-sheet/
Vector Images, icons and psds, even website templates
http://all-free-download.com/