Anything You Want" by Derek Sivers, the founder of CD Baby. Sure, it's a bit of a dotcom legend now. He started CD Baby for $500 dollars and sold it for $22 million. There are still some good thoughts in this book to anyone starting their own thing.
"If you're not saying HELL YEAH about something, then say no."
"Ideas are worth nothing unless executed"
Like I said, lots of good thoughts. One of the most inspirational is that, in his opinion, starting with no funding is an advantage AND one should not use lack of funding as an excuse not to move forward. I am assuming most of us could use more funding, so it's a valuable lesson.
As for me, after the most tumultuous year I have had in a long time, I am back to doing what I love. I think the main thing I have learned, after being within reach of my dream back in 2002, is to just keep up momentum. It may only be a little momentum, but keep it up. If you find your momentum has died...picking up this short one-hour-read might be a good way to get it back.