Youtube.com : $1.650.000.000 : Google bought Youtube and all services for the most expensive price on the web.
Sex.com : $14.000.000 the most expensive domain sale of all the time( the word "sex" is the most searched word online)
Fund.com : $10.000.000 sold in 2008
Porn.com : $10.000.000 in 2007.
Business.com : $8.000.000 in 1999 by an californian advertisement program.
Diamonds.com : $7.500.000
Beer.com : $7.000.000 (why not drinks.com , water.com, alcohol.com etc ?)
AsSeenOnTV.com : $5.100.000 in 2000 and probably the most terrible expensive domain name