I've read several.....the hardest part is making a concrete, written budget and STICKING to it.
We never..ever...wrote down a budget. Chalk it up to stupidity, more money than sense, or whatever but it's truly enlightening to see where all your cash goes. We always carried a balance on a C/C, had a decent savings, small portfolio, sent the kids to private school, etc... Then this year after reading one of Dave books, we sat down and wrote down everything....then crossed out the "mad money" that just left our account and made a systematic plan to eliminate all consumer debt except the mortgage in the next 12 months. The plan is very realistic and doesn't require any craziness like eating mac-n-cheese for 6 weeks straight.
I would encourage everyone that hasn't sat down and wrote out a hard budget, to do it. It's eye opening when you see how many times you run to Kroger for little things or stop by McDonalds for the kids on the way somewhere. We were spending about $600 a month in little stuff.