If you don't have your own shit togethor productivity wise: Getting Things Done, David Allen.
This: http://managinghumans.com/ might be what you're after in terms of Engineering/Development management
Gerber's book is brilliant and is a very highly recommended entrepreneurship book. BUT -- that might not be what you are doing at this stage... It is completely offline focused, and it doesn't really address the "make something people want then figure out a Bus. model" approach. To really boil it down: "Work on your business and not just in it" It's key focus is getting technicians (eg: a baker) to drop the tools (eg: stop baking) for a bit and look at the bigger picture of where there business (bakery) is going.
In short -- it's a worthwhile read, but it's not a GTD for organisations. It doesn't have the deeply practical stuff (list this, do that, etc) and probably isn't the right fit for a group of programmers...