TryRuby.org is an intermediate - advanced tool that helps you learn the programming language Ruby. Useful for developing mobile tools and other web 2.0 products!
This blog publishes promotions, book recommendations and debates you can comment on, like "Arial vs Helvetica: War is Hell." Designs to enjoy include "31,000 Flights Over Holland." Through Observer Media, the site also dabbles in audio and video design. Design Observer originated in 2003 thanks to Michael Bierut, William Drenttel, Jessica Helfand, Rick Poynor and Ruby Studio.