Interesting books about self improvement and such?

[aflaba]

I've just read "Mastery" by George Leonard after seing it recommended on this board several times. It is a really great book.

I don't know if it will help me in any way but I hope so. Anyway it has been a great read and it has felt like a smaller enlightenment.

Are there any other books about self-improvement, life strategy and similar topics that you guys can recommend?

I'd be really interested in reading more books on those broad topics. Some more narrower topics that spring to mind are
-"Increase your energy"
-"Sharpen your concentration"
-"Quit procrasinating"
-...

This post is about books so I can understand if some people think it is better fitted for the books forum. I however feel that it is better suited for this forum.

Thanks!