Madrid 2009, the big shots reunite come up with this rough agenda for future research in linked data:

http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/LinkingOpenData/MadridBOF/

and here the Top10 items:
http://esw.w3.org/topic/SweoIG/TaskForces/CommunityProjects/LinkingOpenData/MadridBOF/TOP10