Here is a list I have compiled of links I found helpful or interesting.
- Haqking's Blog
- Shadows of epiphany - bodhi.zazen's blog
- InsanityBit - Hungry Man's blog
- Zack Reed's Blog - Outstanding site with tutorials and general information.
- The blog of Eight - Not Found's blog
- Total Validator - HTML 5/CSS/Accessibility validator
- 456 Berea Street - Web development and CSS tips
- Pearsonified - Golden Ratio Typography Calcuator and general tips
- PXtoEM.com pixel to em conversion calculator (with CSS!)
- Unitinteractive - Better font stacks
- Calomel.org - Open Source Research and Reference
- ShellCheck - Bash script checker
- Cron Sandbox
- Qualys SSL Labs - SSL server test
- Hynek Schlawack's Blog - Hardening Your Web Server’s SSL Ciphers