Instant MBA 1-10, Redux: here.
Instant MBA 11 (the detail here): SuperModels. A model summarises all the necessary great thinking you need into one simple process. A model can act as a catalyst to your business thinking.
Instant MBA 12: Thought Leader Tom Peters. Perhaps one of the most useful contributions from Tom Peters has been the concept of 'Brand You'. Here's Tom's 1997 Fast Company article.
Resources
Great business bloggers such as Michael Wade and Tanmay Vora.
Instant MBA, the book
Brilliant at the Basics of Business 100, the book