if you want some other books to read, here is a great list
i went to Amazon and just searched "small business marketing" in their books section, and this is the result.
http://www.amazon.com/s/ref=nb_ss?ur...ting&x=17&y=17
The first book is Duct Tape Marketing - now I think this is the best small business marketing book available BUT I AM BIASED. I am a Duct Tape Marketing coach :-)
Jay's book (which gave me some great ideas) is listed there as well.
#9, word of mouth marketing is another excellent book.
I have not read the others, but I think they are ranked by popularity and there should be a ton of reviews for each.
I also wanted to say beancounter makes an excellent point. Even if a book gives you one idea that makes you money, if your your return on investment (Profit divided by book price + your time to read + plus cost to action idea) is positive then you're ahead.
ok, VERY rudimentary calculation but I am just illustrating a point.
Cheers