Responsive web design

Techniques

Responsive Data Tables
http://css-tricks.com/9096-responsive-data-tables/

CSS: Elastic Videos
http://webdesignerwall.com/demo/elastic-videos/

Convert a Menu to a Dropdown for Small Screens
http://css-tricks.com/13303-convert-menu-to-dropdown/

Fluid images
http://unstoppablerobotninja.com/entry/fluid-images/

Responsive design for email
http://wildbit.com/blog/2011/06/30/design-for-the-largest-mobile-audience-email-clients/

Frameworks and Tools

resizeMyBrowser
http://resizemybrowser.com/

The 1140 grid
http://cssgrid.net/

Tiny Fluid Grid
http://www.tinyfluidgrid.com/

Skeleton
http://www.getskeleton.com/