i really want to focus on building up my shoulders. i've made nice gains the last year on my arms, chest, and even got the six pack i wanted... but i still not satisfied with my shoulders. so.. what tips do you guys have for getting big broad shoulders?

what kind of routone do you suggest? how many days a week? higher weight, lower reps for size? what excersises are the best? and anythign else of course...

thanks a ton guys.