It's not unusual for my coworkers to come to me seeking my help with .NET, HTML, JavaScript, or just about any other geek topic.  What isn't so obvious to them is that more than half of the time, I don't know the answer to their questions.  My black belt in Google-Fu is what enables me to quickly help them.   Case in point:  Easily 2/3 of all my Google searches start with "site:msdn.microsoft.com." 

I cannot over-emphasize this point:  If you want to be an effective developer, learn Google.  To get you started on learning the advanced features, check out Google Guide.  When you're ready to put your skills to the test, try Gwigle.