WASHINGTON, Feb. 14 /U.S. Newswire/ -- The total buying power of the U.S. gay, lesbian, bisexual and transgender (GLBT) adult population in 2006 is projected to be $641 billion, according to the latest analysis by Witeck-Combs Communications and Packaged Facts (a division of MarketResearch.com). The estimate was originally derived in a joint study by both organizations entitled, "The U.S. Gay and Lesbian Market." In 2005, the gay buying power projection was estimated at $610 billion, comparing favorably with the African American, Hispanic and Asian markets.