One of the other books I'm making my way through right now is Seth Godin's Linchpin. The book is about making yourself indispensable so your company can't do without you because you're so unique and valuable.
One of the topics is passion. I recall when I was interviewing for the job I have now, one of the interview questions was "what are you passionate about?" Of course I said project management.
The idea here is that if you're passionate about something, you are going to work on it not because you're getting paid but because it's important to you, the end result is you become a linchpin.
So my question to you...are you passionate about what you are doing? If not, how can you find the passion?