When's the last time you made a conscious effort to add a new tool to your development toolbox? Not just the last time you were assigned to use a new tool. When did you last go to the home improvement store and just browse?
I know that you can do amazing things with that abacus and slide rule, but you should really check out this new gadget... it's called a calculator. I think you'll like it. ;)
On this vein, you should really check out Andy Hunt's latest book, Pragmatic Thinking and Learning: Refactor Your Wetware. It's a fascinating look at how we learn, and how we can do it better. If you've heard Andy speak on these topics, you've already got a good idea of what you've got in store. I've borrowed much of his content for my talks (but I always give him credit!) :) What can I say? It's great stuff.