These are some web sites that I use a lot.

• Apache
  The best (and most popular) open-source web server
• B&H Photo Video
  A great source for all sorts of photography-related and IT-related products
• Bruce Schneier
  Security consultant and bloger
• Drupal
  An open-source content management system
• FreeBSD
  The most stable, reliable and feature-rich open souce operating system
• Great Hackers
  An essay that I think captures the essence of what makes a great hacker
• mySQL
  The world's most popular open-source database server
• PHP
  An incredibly flexible web-focused scripting language
• Wikipedia
  The world's best source for encyclopedic material
• XKCD
  Perhaps the funniest and most insightful web comic