Which publishers produce the best marketing campaign results?

Which publishers should receive more marketing dollars? Which should receive less? Should any be eliminated?

Which publishers would benefit from changing tactics, i.e., changing keyword, match type, and bid strategy?

Which publishers would benefit from improved copy, i.e., improving the wording in the search ad or the content on the landing page?

Kayak click data is not available through DoubleClick. How does Kayak compare to the other search engines? Would you recommend more or less funding for the Kayak SEM campaign?