The Beauty of Batches - Being "in the flow".
I often try to explain "the flow" to my non-geek friends and family, but I'm never quite sure they leave the conversation understanding it. I am a big fan of batching work throughout the day, and I practice it off and on. When I am not practicing it, it's normally because I've been interrupted in some way, or wandered out of "the flow" by way of Digg or YouTube, etc.
Here's an article that references a book and links to another article, all relative to the topic at hand: