I'm going to have to do a search of my hard drive and back ups because I downloaded a VERY good article a few years back about bodybuilding and building muscle around wrecked shoulders.
It was a very detailed article explaining how your shoulder works and all that sort of stuff.
It described a lot of the ways your shoulders can be injured.

Most importantly though, it had a long list of exercises that you should AVOID AT ALL COSTS if you have bad shoulders. I really wish I could remember some now because although training is the best way to help your bad shoulder, if done incorrectly it could be worse than doing nothing at all.

Anyway, it also had a list of a few very good weight training exercises that did not put your shoulders in jeopordy at all and were very good at building up the shoulder muscles and the smaller connecting tissue muscles.

I'm going to have a look for it this evening so if you bare with me and check back in a day or 2 I should have it posted, or I can e-mail it to you or something.

I today still follow some of the advice I read in that article to protect my shoulders. Their were some exercises listed that you shouldn't put your shoulders through PERIOD if you want them to still be working perfectly in 10 years time. So i'll hunt it out for you.

Oh, I remember I got the article from www.hardgainer.com
I think they've taken down most of their articles, but if you want to go the extra step, you could probably e-mail them and they might be able to dig it up for you. Hopefully I can come through though and save you time.