Modular Grid Pattern
Useful web app to generate a grid pattern
The Human Body in HTML and PHP
Fun
gridr buildrrr
Grid builder
swissmiss | The Ancient Art of Email Templating
Take off that beanie and put that Zeldman book down, you hippie. There are no standards in HTML email.
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.
Jeditable
Edit In Place Plugin For jQuery