Regarding the sample data here --

MapPoint Download - MP2K Magazine
MAPPOINT DOWNLOADS: License Agreement - MP2K Magazine

Claritas Newspaper Downloads: 1574
File: Size(bytes): 192962
1999 estimated numbers for overall demographics (population, income, age. race, employment, language, ); expenditures by category, sales by establishment type, count of establishments by type, HH by Prizm group
All variables to Zip, Census Tract, and Block Group level for the entire United States
Someone recently asked me how to open these in MapPoint. They are DBF files. Using Excel, you can import the DBF files and save as an Excel file or export to CSV. These files can then be imported into MapPoint.