As we anxiously wait for Manny Ramirez, Orlando Cabrera and others to sign, remember to keep an eye on MLBTR's list of remaining free agents for 2009 (there's also a link under MLBTR Features, on the right side of the site).
Beyond Manny and Cabrera, there are a few lefty relievers available (guys like Joe Beimel and Dennys Reyes), as well as some older position players that may have some pop left in the bat yet. Do any teams need a centerfielder than can hit righties, like Jim Edmonds? Will the Cardinals go after Mark Grudzielanek to replace Adam Kennedy?
Manny aside, there are still a few other impact players on the market to keep an eye on.