Software development / Sources of information
From WhyNotWiki
http://andy.pragprog.com/ Andy's Blog
http://codekata.pragprog.com/ CodeKata
Getting good at a discipline requires practice. Over on the CodeKata blog you'll find challenges to hone your developer skills.
http://www.techinterview.org/ techInterview - puzzles and interview questions
Welcome to techInterview, a site for technical interview questions, brain teasers, puzzles, quizzles (whatever the heck those are) and other things that make you think!
http://greenprogrammer.blogspot.com/ (Rails, etc.)
http://www.io.com/~jimm/blog/ (Programming, Ruby, ...)
- http://code.whytheluckystiff.net/ is a beautiful index page to his Subversion repository
http://www.randsinrepose.com/ -- Software development, management 
http://www.timhardy.net/wordpress/ Tim Hardy -- Programming, software, computer science
http://www.ntecs.de/ (Michael Neumann) -- Ruby projects, interesting personal info/projects, Mathematics/Algorithms, most in en/de
- Languages Page (en, de) - with hundreds of examples in more than 130 different programming languages, including APL, etc.
