Hollywood Life Magazine

I think the best links would be on Wikipedia.

Wikipedia has a whole section devoted to the Oscars:

http://en.wikipedia.org/wiki/Category:Academy_Awards

Here is a list of all Best Picture winners:

http://en.wikipedia.org/wiki/List_of_Academy_Award-winning_films

Here is a link to all the Oscar Winners and Nominees for all major categories since 1927 up to 2006 I think. (You have to download a .CSV file)

http://www.aggdata.com/awards/oscar

Hope this helps.

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