The two bulletin boards that I have in my work room are used for different purposes. This first one is larger, more easily accessible and requires no thumbtacks to put something up. So it gets changed more often, has more current, topical, things like show advertisements, birth announcements. I have things hanging off the bottom too, a green silk scarf I'm supposed to do something with, and a cool black/white/green zipper I want to use for a bag or jacket. This is mostly just a hodgepodge of stuff I want to look at more than once or an image I want to revisit.
The second one is smaller, much harder to reach as it hangs over my wide cutting/work table and requires a new thumbtack to be hunted up to hang something new on it. I have inspirational images,things with color combinations or patterns that I enjoy, quotes and words and a few objects hanging on here, a collage of myself in a way. It doesn't change as much, but it gets update occasionally, usually when I clean off the other bulletin board.
The coolest artist bulletin board I ever got to see in person was probably Judith Content's, it took up almost a whole wall above her desk I think. And if I recall correctly she takes everything down on a yearly basis and puts it in a book, then starts over again filling up the blank wall.
Do you have something similar in your work space?