There is very little to get excited about when discussing the 2012 second base free agent crop.
The top potentially available names are very unlikely to reach free agency, because their teams will most likely exercise their options and delay their free agency by another season (or two).
Aaron Hill showed a bounce-back following his trade and change of scenery. Kelly Johnson also showed a bit of boost to his batting average following his own trade.
The two could bounce back in 2012 and be great pickups for contending teams, but there is really no way of knowing if they will return to their prior form or further regress.
Mark Ellis was solid defensively, as always, and showed an offensive bounce-back from his early-season struggles. He'll also be 35 years old, though, and may not be able to produce enough offensively to justify staying in a starting role for many more seasons.
Beyond Hill, Johnson and Ellis, there is a group of aging players perhaps better suited to utility or bench roles and late-inning defensive replacements, if they keep playing at all.