Here are some tech links that I visit frequently:

Oracle
www.oracle.com - the official website
metalink.oracle.com - great support site for registered customers
otn.oracle.com - worth a visit every day
asktom.oracle.com - both educating and entertaining
www.rittman.net/ - invaluable information about Oracle products

Linux
www.gentoo.org - I great Linux dist I became addicted to
www.lpi.org - get on the Linux track

Microsoft
technet.microsoft.com - resources for Microsoft products
www.microsoft.com/data - Microsoft data access technologies

Sun
http://java.sun.com/downloads/index.html - Resources for Java developers

News
www.silicon.com - great tech news
www.heise.de - tech news in German

Resources for Computers
www.lavasoft.de - great tool to remove spyware etc.
www.safer-networking.org - another great tool to remove spyware etc.
www.grisoft.com - lean and effective antivirus software
Get Firefox! - rediscover the web