Along with Shoulder Savers by Eric Cressey here is another good one from the great folks at DieselCrew.com
Bringing Back the Shoulders Pdf.
And here is the post with Shoulder Savers again:
Both of these are about Pre-Hab. If you have a present injuries your needs may differ. But if you want to keep your shoulders healthy or you have already re-habbed an injury and want to help prevent a recurrence, this is the info you need.
More good stuff:
Jim Smith's report on Cressey's (and Gentilcore...he's great too) Sturdy Shoulder Seminar
Sturdy Shoulders Recap
Jimmy Smith also has a lot of rehab vids on youtube. I wouldn't suggest you just follow the routines blindly without knowing as much as possible about your problem and what you may or may not need but it is a great resourse for viewing the exercises: