thanks to all for trying this out and let us know how it works

http://p2pfoundation.net/Special:MultiCategorySearch

explanations: http://p2pfoundation.net/Combined_Category_Searching#The_benefits_of_using_multi-category_search

resources:

http://p2pfoundation.net/List_of_Key_Categories_on_the_P2P_Foundation_Wiki

http://p2pfoundation.net/List_of_Media_Formats_at_the_P2P_Foundation

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Check out the Commons Transition Plan here at: http://commonstransition.org

P2P Foundation: http://p2pfoundation.net - http://blog.p2pfoundation.net

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#82 on the (En)Rich list: http://enrichlist.org/the-complete-list/