I think the joint placements are looking pretty good, I sketched up what the controllers could look like. For the shoulder it would be great if I could click on the control and translate the shoulders xyz, rotation may be necessary also for poses where the character is reaching upwards or when the elbows are in, I find that a lot of rigs have problems with the shoulders looking ugly in these kind of poses.

Brock Joint Placements Draft 1

It's a little confusing, but here is what I was thinking for the joint placements.  The blue is the leg, purple the arm and green the center/spine.

EDIT: I made the image a little bigger (I know it looks terrible on the blog, but after presenting in class, I realized it was near impossible to see joint placements even when zoomed in)