This seems like a great place to list some resources for anyone trying to learn HTML email. This is (probably) the most comprehensive list of HTML Email resources you will find on the web. Happy learning.
Getting Started Guides:
CSS Support & General Guides:
You should always inline your CSS in html-email. Here is a list of CSS Inlining Tools
Responsive Guides:
Templates & Frameworks:
Responsive Alternate Examples:
Also the Ted Goas Responsive link above has an excellent fluid example.
Troubleshooting & General Guides:
You'll need to use VML to get background images working in Outlook (Except in the body tag). Here are some VML links:
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