With so much rapidly changing technology, its hard to know what websites, programs gizmos, etc. are going to be useful in your career. Everything's happening so rapidly that few of us can keep up with it. I often get the impression all technical innovation could cease for five years and people would still be catching up with ways to use current technology.
This is becoming more and more of an issue in the career arena for we pro-geeks because our careers often rely on advanced technology, if not involve outright working on it. We don't want to miss out on the latest innovation, we want to think for the future and be in on whats next.
The problem is we often only see half the problem.