Modular Grid Pattern
Useful web app to generate a grid pattern
CSS3 Please! The Cross-Browser CSS3 Rule Generator
You can edit the underlined values in this css file but don't worry about making sure the corresponding values match, that's all done automagically for you.
HTML-Ipsum
Handy stubs for lists, paragraphs, forms, etc.
zen-coding
Set of plugins for HTML and CSS hi-speed coding
Vikjavev.no - Unsharp Mask for PHP
Clever
Transforms
Jeditable
Edit In Place Plugin For jQuery