Microsoft chairman architect Bill Gates is still the wealthiest person in America with a total of $51 billion, according to Forbes' annual list.

Four out the top five richest Americans represent the technology industry, with fellow Microsoft founder Paul Allen, Michael Dell and Larry Ellison trailing Warren Buffett.

Larry Page and Sergey Brin were the big movers on the 2005 Forbes 400 list. The Google founders vaulted to number 16 and 17 with $11 billion each. Google CEO Eric Schmidt followed at number 52. Meanwhile, Steve Jobs took position 67 on the list with $3.3 billion, while Amazon's Jeff Bezos dropped from number 38 to 42.