Consistency Made Simple : PLOP
Plop is a little tool that saves you time and helps your team build new files with consistency.
24 ways: Front-end Style Guides
Links to Style Guides
Browser sketch sheets for Web Designers | Sneakpeekit
Large sketch sheets collection with many different canvasses, grids and PSD grid templates
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.