I also noted that it appears to be a raw export of the data fields, there does not appear to be any error checking. For example, I spot checked a few city/state combinations where I've lived and seen errors. Just for giggles, I assumed that zip codes were probably the most correct. So I grabbed a zip code database and backed out the proper city and state.
I would love to compare vs. AMA member data base to see how good is the market penetration in each area - compare members vs. registrations. Might be a place to target advertising to scoop up more members (see Porcia...actually helping...not totally against AMA).