Check out Fortune’s annual ranking of America‘s largest corporations.
http://money.cnn.com/magazines/fortune/fortune500/
According to an article in USA Today, 2005 was a banner year for corporate buyouts (http://www.usatoday.com/money/companies/2005-12-18-buyouts-usat_x.htm). With change comes opportunities. So whether you are actively seeking a new position, strategically considering your next move, or happily employed and interested in what your competitors are doing, this is an all-around great resource.