Also, a good companion to this book is Dave Ramsey's book(s) on getting out of debt. I know he isn't always popular around here, but his "snowball" principle of paying off the smallest bill first & going from there really works for a lot of people. I don't agree with everything he has to say (for example, leasing cars - that worked out to my benefit tremendously for a good 10 years or so), but he has some really solid base principles like the Rich Dad book has.
Disclaimer - I'm taking Financial Counselor training at Dave Ramsey's HQ this July. I believe in his system, and frankly, it works in most cases if you're willing to follow his advice to the letter.
That said, yes, Dave Ramsey's snowball method makes absolutely no mathematical sense whatsoever. I would never debate otherwise and if you're extremely disciplined with money, then you probably don't need his help getting out of debt in the first place. His (Dave Ramsey's) methods are setup to give quick wins with money to people who are currently mismanaging it. The psychology of it all makes good sense to me given my anecdotal interactions with people who don't manage money well. They need and thrive on those quick wins to keep the snowball rolling on.
Since I'm already off topic, I would recommend Broke USA by Gary Rivlin and The Millionaire Next Door by Thomas Stanley and William Danko to get your brain thinking like a rich person. Broke USA will teach you how the financial industry if fleecing the sheeple (and thus how you can avoid this fleecing) and TMND will give you a reality check on how truly rich people live their lives. I actually would not recommend TMND for judging your PAW/UAW/etc. status unless you're over 50 years old. At that point, I feel their calculations have some merit.
One final food for thought tidbit. The average person spends less than 4 hours a month considering what they are doing with their money. The average person is also broke or at least living paycheck to paycheck. One unifying thing in this thread is everyone posting their opinions about finances, even though they may have different opinions, is probably above the 4 hour average and I would wager they are doing just fine financially. My recommendation...spend the time to get yourself educated about how to handle money. There is a lot of personal growth and peace to be had when you attain and apply this type of knowledge.
Another disclaimer - I'm proud to say I'm debt free as of November 2013, at which time I paid off my mortgage. I had been putting 20% into my Roth 401k and have 529 plans for both of my son's college educations several years from now. Now I'm doing 30% into my Roth 401k with increases to stop at 40% of my income 10 years from now. I'm 36, and to quote Dave Ramsey, I'm living like no one else. In short, I raised up my income significantly (especially over the last 4-5 years) by working hard, while keeping my expenses constant; at the end of the day it really is that simple.