Start with his website, specifically his seven steps. Most everything else is around motivating people to actually do the plan. As he often says personal finance is 80% personal and 20% finance, by which he means that things that make sense finantially (paying off high interest debt first) don't necessarily motivate action (so instead pay off the smallest debt first to get motivation).

Really the rest is details around those seven concepts. On his site there is a link to a free one-hour podcast for the iPod, and you can pay for the full three hours of his radio show on podcast. He started on radio, and it is probably his best format.

The reason Dave Ramsey has limited appeal beyond the US is that he is explicitly evangelical. He views his system as an extention of his Christian beliefs. That sells very well in parts of the US, but doesn't port very well. There is actually nothing religious in his program, other than the occational reference to biblical verses in an attempt to tie his program into his religion, but people who are really interested and want to teach his program, not just practice it, are going to find they need to be an Evangelical (or at least a Christian) to fit in.

His books:

The Total Money Makeover - This is a very step by step approach to what he teaches about how to handle money.

Financial Peace - This is a more philosophical approach to the same topics. More idea and less application based.

You can catch his radio show online for free - or an hour podcast each day in the itunes store - this is free.

You can watch his TV show on Hulu.

My beef with day (and to ape Yishai's answer a little) is that his good advice is no different than anybody's good advice. The seven steps are on the home page, Clark Howard, Suze Orman and probably quite a few others all chat about spend less, save more, shop wisely and live within your means.

Anything specific is just motivation, and it sort of irks me that Dave Ramsey charges $100+ buck to go to a seminar about how to save money. A $30 book to read anecdotes and examples of how to follow the seven steps. (Probably, I won't buy his books)

I have no problem with somebody making money, but I doubt that Dave is just barely breaking even. I was stand corrected if he is, but I just don't suspect he is.

Clark Howard recommends that people go to the library and check out his book; he is a lot closer to practicing what he is preaching.