The Knowledge Bubble
Everything you know is contained in a bubble. As you learn about new topics your knowledge bubble gets bigger. It's a simple premise, really. Sometimes you think you have a really big bubble and then the realization of how little you know when somebody tells you about a new concept you've never heard of. You suddenly and furiously find yourself trying to increase the size of your bubble with this new knowledge.
These days, I find myself reading up on more discrete topics such as Extreme Programming, OOP concepts, or Star Schema databases.
So, what are reading up on these days?