What would be in Boldin trade for Cardinals?

Posted by ESPN.com's Mike Sando

Does Derrick Mason's retirement make the Ravens more likely to pursue a veteran receiver such as, oh, I don't know, the Cardinals' Anquan Boldin? Darren Urban of azcardinals.com thinks so.

I just don't know what the Ravens could offer in return to help the Cardinals more than Boldin would help them this season (while making salary-cap sense for both teams).

And if the trade wouldn't help the Cardinals this season, then what would the Cardinals be telling quarterback Kurt Warner heading into what are probably the final two seasons of his career?