David Carr to visit Saints...
I'd prefer re-signing Martin or even signing Harrington over Carr. Carr has never shown any real ability to be an NFL QB.
Harrington had stretches where he played well. In fact, he wasn't terrible last year. For 2007, Football outsiders has him as the 21st rated QB ahead of people like Gray, Pennington, Culpepper, and VY(!) Over the years, his number show he is a marginal starter (rated 25-32) which makes him a good backup.