The Giants, at this point, seem like the favorites to get Jason Bartlett. I recommend that you read this, and this.
I looked at Bartlett earlier...you can read it here.
At this point, I think that Bartlett is the best shortstop available, behind J.J. Hardy. I don't consider Jose Reyes, Stephen Drew, or Jed Lowrie to be legitimate possibilities, simply because their teams would ask for a lot in return, which the Giants are not willing to give up.
Bartlett will cost around $6MM, and will probably be traded for a couple of relievers or pitching prospects. This isn't too much, considering his potential. He obviously won't match his amazing 2009 numbers (.320/.389/.490), but taking into account his speed, he will be a solid offensive shortstop. He'll probably hit .280 with a little bit of pop and plus speed. His value essentially depends on whether he'll continue to decline defensively, or somehow recapture that magnificent defense he had several years ago. For $6MM, though, he's not a huge risk.
He'd be a great addition for one reason. He would significantly improve the Giants' running game, which was essentially just Andres Torres in 2010.
