I just stumbled across this on ESPN, and while not helpful from a "who should I start this week" perspective, it is very helpful for THIS:
Editor's Note: These rankings are meant to capture fantasy value from today through the end of the NFL regular season. We'll publish them Tuesdays during the season to help you decide about trades and waiver-wire acquisitions
http://sports.espn.go.com/fantasy/football/ffl/story?page=rotowski091124They adjust the ranks every week, and as the season comes to a close, remaining matchups play more and more of a role. I think this is the best trade analysis tool I've found yet, and so from now on, this column is the benchmark I will be using to compare trade values. I expect to avoid any concerns about personal biases or other dispute bullshit in this way.
I know trades are done for this year, but I just found this column and bookmarked it for next year. It is an outstanding point of reference.