Two interesting articles on the draft have links below. They both refer to a study done by 2 Economists that evaluated the value a team gets from picking in different areas of the draft. The conclusion is that trading top picks for lower picks helps a team succeed in the future. The cost benefit of drafting a first round player is lower compared to trading the pick for later picks. I found it interesting but I am a financial analysis so I usually like the statistics that are part of sports.
http://www.coyoteblog.com/coyote_blog/2005/04/economics_of_nf.html
http://www.aei.org/publications/filter.all,pubID.26118/pub_detail.asp
http://www.coyoteblog.com/coyote_blog/2005/04/economics_of_nf.html
http://www.aei.org/publications/filter.all,pubID.26118/pub_detail.asp