I've been a marketing manager for my own small businesses and the largest corporations. I found this book to be a concise guide to help small business owners understand the purpose of marketing (hint: fame is NOT the goal). The sections on profiling your prospect base and developing your marketing message targeted for those prospects was simple and straight-forward. For me this was the most valuable section. It's too easy to guess what your customer's needs are and make up marketing messages off the top of your head that are totally ineffective. The book concludes with a good roundup of communication channels, advertising, tradeshows, internet, events, etc., and when to use them to deliver your message most cost effectively.
If you're an old pro, the book brings you back to basic principals, and if you haven't taken Marketing 101 in college and need to get a handle on marketing for your business ASAP, this is a good guide.