The one thing that I very much disagreed with the author (David Bach) on was the rainy day (emergency) fund that he recommended that people set-up. Personally I think that this is a bad thing if you own a house.
Your emergency fund has a multiple of your monthly spending to tide you over if you are unemployed or otherwise need emergency cash. This is sitting in a rolling CD or savings account earning 2%. It is also money that you will hopefully never need and so will most likely sit there for years. You are also being taxed on this 2%.
A much better option, in my opinion, is to put that money into your mortgage where it will save you 6% to 7% (tax free). Then setup a HELOC against your house that you never use except for that emergency. If you do the math, then you'll see that the cost of using an 8% to 9% is very cheap compared to the rainy-day fund because you will never or rarely use it and when you do you'll pay it down first instead of making extra payments to your mortgage.