Rather than write a novel on why I think Lyle Overbay could be reasonably traded for I'll simply post facts:
-Overbay posted three consecutive seasons of .800+ OPS between 2004-2006.
-He averaged 44 doubles per season in those three years, with his high mark being 53 in 2004.
-JP Riccardi signed him to a four year, $24 million deal after an impressive 2006 campaign.
-He had a disappointing 2007 season (OPS .706)
-He rebounded a bit in 2008 (OPS .777) but still fell considerably short of expectations
-He is owed $14 million over the course of the next two years ($7million per)
-Riccardi would probably be willing to trade him if he could get back a position player that could contribute offensively -or- a starting pitcher since AJ Burnett will almost certainly opt out of his deal.
Mitigating circumstances that warrant consideration:
-Mark Teixeria will cost a fortune, and the last time the Yankees paid a first baseman a fortune he wound up being grossly overpaid, at least most of the time.
-Overbay's 2007 and 2008 campaigns could suggest he's not the answer, but if he reverts to 2004-2006 form he could be a valuable, relatively affordable asset.
-A change of scenery might do him good...the last two times he got traded he posted OPS numbers of .863 (2004 Milwaukee) and .880 (2006 Toronto) in his first seasons with his new ballclub.