Links
Blogs
What Beautiful HTML Code Looks Like Copy of PDF from CSS-Tricks
Convert
WeasyPrint is a visual rendering engine for HTML and CSS that can export to PDF
Database
Learning
Mail
https://github.com/seanpowell/Email-Boilerplate Guidelines for formatting your email to avoid some of the major styling pitfalls in HTML email design.
Popup
<a href="#" onClick="MyWindow=window.open('http://test.co.uk/where.htm','MyWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=310,height=365'); return false;">PLACE_YOUR_LINKTEXT_HERE</a>
Tools
http://htmlcleaner.sourceforge.net/ Transforms HTML to well formed XHTML.