Ruby

http://mjtsai.com/blog/2002/11/25/perl_vs_python_vs_ruby/ interesting post that provides syntax difference the languages and some discussion about their importance. Good code examples.

http://www.37signals.com/svn/posts/753-ask-37signals-how-do-you-process-credit-cards useful article and (especially!) comments about ecommerce systems

http://www.fudgie.org/ OpenGL log visualization (ssh and tail) – pretty cool!!!