I think I’ve read about a zillion books on time management. Partially due to work, because work is sometimes like getting bludgeoned with everything all at once.
I found this quote on Cal Newport’s blog, and it really fits:
At some point, however, you have to put a stake in the ground and say: I know I have a never-ending stream of work, but this is when I’m going to face it. If you don’t do this, you let the never-ending stream of work push you around like a bully.