Linux:

Linux Journal Linux Gazette Slashdot Freshmeat NewsForge OSTG OSDir

Testing:

openQA Selenium Selenium Archive Watir API Watir Archive

Cookbooks:

PLEAC

Tech News:

SecurityNow AnandTech Red Herring HackaDay

Ruby:

Core API Standard Library RubyForge RAA Wiki Weekly News RedHanded Planet Ruby Eigenclass RubyGarden Rails Wiki

News:

Yahoo News Slate Grist Common Dreams NY Times Sun-Sentinel CNN BBC Deutche Welle Le Monde FAIR Mail & Guardian Economist spaceweather.com

Comics:

doonesbury calvin & hobbes dilbert