Here are some minor leaguers to watch, although in yahoo they normally come into the league on waivers, not FA, if they didn't play last year.
(Should be back up sometime this year, just not sure when. He had 60 swipes btwn AA/AAA/MLB last year)
BJ Upton (If he ever gets the call, TB has been hesitant b/c of his poor fielding)
Lastings Milledge (long shot to get called up)
Anthony Gwynn (also a long shot)