Thanks everyone, but it looks like I'm getting conflicting statements here.
Kenaces, you say that money grows tax-deferred, and withdrawals for education expenses is tax free. Do you have a link to where you see that, because that would be awesome. It would basically mean that a 529 is an HSA for education, where you don't pay taxes on either end, as long as it's earmarked for education. If that's the case, then a 529 is better than either a Roth or my 403B, and I should be filling up at least enough to cover college for the kiddos.
seattlecyclone, you say that it is like a Roth, so post-tax money is used, then you don't pay tax again on it. Do you have a link to see that. If true, that would not be as good, but what I really want is to just fully understand this.
Or if anyone else really understands it, please chime in. From what I've read it seems more complicated than just a normal roth or traditional 401k.
Thanks again.