Chegg: http://www.chegg.com/
How it works: http://www.chegg.com/how-it-works.aspx
Read more about it in Business Week, "Web sites challenge the textbook goliaths" http://www.businessweek.com/technology/content/jan2007/tc20070117_348380.htm?chan=technology_technology+index+page_more+of+today%27s+top+stories
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