Here's a little research I did for another thread on the same subject:
"Here are a few (or a team) that I'm keeping my eye on - also I'm overlooking the obvious candidates (or trying) like Joba - these are mostly deep sleepers:
ROCKIES: Depending on how the rotation works out, MORALES could end up on the pen, also watch for TAYLOR BUCHOLZ - he could be a big surprise and will definitely be in the pen.
GIANTS: When (and if) Lowry gets back, either SANCHEZ OR CORREIA could be valuable.
METS: JORGE SOSA
LAA: I agree that Shields is on the outs, and when Lackey gets back I think that MOSELEY could be a solid Hold guy.
STL: If Isringhausen falters then Springer or Franklin might close, and depending upon how the rotation shakes out, THOMPSON could get some holds. (if he's not starting, if he is WELLMEYER might relieve)
TB: If he doesn't start and they don't send him down I like HOWELL.
HOU: Could get ugly, but CHACON. (update - he's starting)
PITT: See above, but KIM.
WASH: HANRAHAN - very good sleeper for Holds, maybe the best of the group especially if Ayala has problems, Hanrahan could be #2 on Nats after Rauch."
Again, I wouldn't draft any of the above, but they're the top SP's (Yahoo) that I think MIGHT get some Holds early - but if you are in a very competitive league and had the roster spots, I'd take a flier on Bucholz or Hanrahan. But by all means, if you find more, please let us know!