One of the things they told us at Engineering School was that they weren't just teaching us "stuff", they were teaching us "how to learn". You can never stop learning. New technologies, languages, frameworks, methodologies are always coming around. Either you keep up, or you fall behind.
I like to think that I've done a good job at keeping up. My resume is filled with a vast array of TLA's that have shown that not only do I give lip service to learning, but that I've done it, and applied to projects. I've worked on C++ with MFC, then COM and ATL, and now .NET. Now it looks as if something big is coming around the corner.
Time to start learning again.