David Allen's "Getting Things Done: The Art of Stress-Free Productivity" is a good companion to The Seven Habits. GTD focuses a little more on the geeky mechanics of self-organization/prioritization.
They are totally complimentary. 7 Habits concentrates on "What to do" and GTD concentrates on "How to do it."
There are two other excellent "self-help" books that should be part of everyone's bookshelf. They are:
* "Getting to Yes" which I think is the greatest book on negotiation. "How to deal"
* "Sources of Power" by Gary Kline talks about how people make decisions. "How to decide"
Give me these four books, and a firm place to stand, and I will move the world.
Are you moving the world right now? Because these books sure make you feel like you can but there is that small matter of actually doing it. (Not being snarky, I sincerely hope you are doing great things).