html mail - css merge

Describe the way how to merge css into html to make it mail compatible.

eMogrifier - tool to deliver that service
PreMailer - another alternative
email-standards.org - how css is implemented in email clients

And few other links that has to be enhanced before it can be used:

• http://digua.sourceforge.net/ 
• html-minifier 
• http://search.cpan.org/dist/CSS-Inliner/ 
• http://www.feedthebot.com/pagespeed/combine-external-css.html 
• http://www.cssminifier.com/
• http://refresh-sf.com/yui/
• http://code.google.com/p/minify/
• http://www.minifycss.com/css-compressor/
• https://pypi.python.org/pypi/slimmer/
• http://csstidy.sourceforge.net/usage.php
• https://github.com/afelix/csso
• http://isnoop.net/tools/css.php
• http://stackoverflow.com/questions/787789/any-recommendations-for-a-css-minifier
• http://code.google.com/p/closure-stylesheets/