Ars Technica [original articles, some good hardware info] Slashdot [news for nerds] Reddit [argue about any topic imaginable] TV Tropes [waste 13 hours and not realize it]
Open Source Projets I use
Logicampus [software to organize school class content] Freecap [creates image with word for user to verify] myphpadmin [database management, but I use some modules for other stuff too] Tiny MCE [web based WYSIWYG editor] Walter Zorn [amazing javascript libraries] jQuery [javascript framework for neato effects] OpenCart [shopping cart software] Redmine [Bugtracking and product managmenet Rails app] Django [Python framework similar to Rails] Virtualbox [Sun's Virtual Machine software] Trac [Bugtracking and product management Python app]
Online Tools I use
IP Block Lookup [find out who owns an IP block] OpenRBL [Advanced IP block lookup stuff] VirusTotal [Scan a file by all major antivirus at once] LinkScanner [Scan Website for any Browser vulnerabilities that may exist there]