Well even in a keeper I doubt you should keep him since his ADP next year will probably be no higher than round 6.
Shame about Chad Pennington. Here's another guy who, as a QB is having a great year (66% completions, 7.61 yards per attempt 3:1 TD ratio, 97.4 QB rating), but because of the heavy emphasis on TDs in fantasy scoring is considered a bust. It's not his fault that the Jets are passing a lot less than league average and the combo of their o-line and Martin/Jordan are so effective in the red zone. He's been very good outside of that really bad decision against the Pats to force the ball to Chrebet. Now that he's hurt, that just compounds the situation. Definite definite great value pick in 2005.