I have all 3 of David Allen's Books and I do consider them very valuable but I assume you want others as well.
Originally Posted by mackiest
The Contrary Farmer by Gene Logsdon - Inspiration, self help and a decent blueprint for running a small farm all in one. I re-read it for the inspirational parts a lot.
The Millionaire Next Door by Thomas Stanley & William Danko - Good for getting you off the debt track.
Confessions of an Organized Housewife - Denise Schofield - Lots of neat tips and tricks for running a house.
Strategic Selling - Robert Miller and Stephen Heiman - Good for anyone in the business of selling.
Startship Troopers - Robert A. Heinlein - OK so you might not think this is a self help book but it's inspirational, a good discussion of the obligations of a citizen and a darned good read. Ignore the movies, they were not the same as the book.
It's hard for me to separate self-help from business from inspirational books because I use them all that way. These are all books I re-read regularly or refer to fairly often.
Oogie McGuire - Mac, iPhone & Omnifocus
OogieM on Twitter
Paonia, CO USA