Which is your biggest problem? Front, side or rear?
Things such as push presses, military presses, jerk's, bent over row's (tho some people disagree with bent over row's) & shrugs should do the trick.
Baring that, of course you could opt for *gasp* isolation movements such as front or side raises. Or my fav....load up a bar (or the smith machine bar), face away from it, hold onto it & shrug up. It's something called a reverse row or something. It'll get you jacked & help out your side / rear delts. Have I helped?