Brian Fuentes, who had the most saves in 2009 in all of baseball, has hit the disabled list retroactive to April 6th. He has been doing some throwing since, so I don't imagine he will be out for longer than the required 15 days, but it does raise some red flags.
These type of injuries tend to keep coming back over and over throughout the season (pun intended of course). Brian Fuentes might come back after April 21st, and he might even pitch fine after that, but my money is on him having back issues further down the line this season.
Fernando Rodney is the obvious pickup in all leagues right now that care about saves. He saved 37 games last season and looks to be first in line for saves for the next week. In daily leagues, you can add him to your lineup now and hope for a rogue save or two. In weekly leagues, I wouldn't play him next week until we hear more news about Fuentes. It's good to pick him up in all leagues though since we now know Fuentes is not 100%. We all know how nice it is to own the closer for the Angels: Mike Scioscia's closers have lead the league in saves for the past two years.
What are you waiting for? Go get Fernando Rodney!