Refcards.com is a site where you can get handy reference cards for numerous open source tools and technologies. They can be printed double sided onto card (or paper) and fold into a three-column, easy-to-carry quick reference. Brilliant! The site had apparently disappeared for a while but is now back. Its author Andrew Ford has produced a new refcard for Template Toolkit. He has included some cards on Web technologies (very useful as handouts for my students!) from Benjamin Jung. Thanks to Chris Winters for the heads up.