David Parrish is a creative business consultant located in the UK (but he works internationally). I stumbled upon his site (link in my Blog Injectors section, too) and was immediately impressed. This guy knows his stuff and he shares it with the world.
One of the best things he shares is his book, in electronic form. TShirts and Suits should be required reading for any creative professional, particularly any who is even vaguely toying with the idea of launching her/his own company. It’s chock full of solid information and, though it is written for a UK audience, the info holds up on this side of the pond too (just don’t get confused with all the alternate spellings :-)) It’s also written in language we all can understand, uses humor, and the design and illustrations are well done to boot.
Go. Download. Read. Even if you’ve been in business for a while. I bet you’ll learn something helpful no matter where you are in your creative career.