I used to think that the brain was the most wonderful organ in my body. Then I remembered who was telling me this. - Emo Philips
I'm reading Time Management for System Administrators, and I have to say that's a great book, filled with a lot of suggestions, if you want to stop working late to start working smart you must get it!
There's also a 45min video with Tom Limoncelli, the author, about his book.