] A new sense of the shifting Internet population
] The online population is fluid and shifting. While 42% of
] Americans say they don’t use the Internet, many of them either
] have been Internet users at one time or have a once-removed
] relationship with the Internet through family or household
] members. This report focuses on several new findings about those
] who say they do not use the Internet

Highly recommended reading for an unbiased look at Who (Doesn't) Use the Internet

Pew Internet & American Life Project