HTML Email Design Gallery

http://www.campaignmonitor.com/gallery/

CSS inliner

Writing inline CSS can be a pain, so we built a tool that’ll do the hard work for you. Just paste your HTML below, and we’ll move all your styles inline. http://inliner.cm/

Guide to CSS support in email

The Ultimate Guide to CSS A complete breakdown of the CSS support for every popular mobile, web and desktop email client on the planet. Download the complete guide for all 18 clients, or see the top 10 below.

Propel: Creating Custom Query

http://llanalewis.blogspot.com/2013/07/propel-creating-custom-query.html