Tom Hanks top sales star
The Hollywood heavyweight and the chat show host topped a new index, ofhundreds of celebrities, targeted at US advertising agencies.
Two-time Oscar-winner Hanks has appeared in more than 50 films, including'Philadelphia', 'Forrest Gump' and 'Saving Private Ryan'.
Winfrey is best known for her TV chatshow, which is watched by 30 millionviewers each week in the US alone.
Jeff Chown - the president of Davie-Brown Talent who are behind the list - said: "Until now, there was no tool created for brands by brands to evaluatecelebrities and their influence.
"We're trying to determine whether this person would help sell a product toa particular demographic."
Last month, Hanks was named America's favourite movie star for the secondyear in a row.
The actor topped the poll despite not releasing any films in 2005.