I’m not sure if this is a bug or a feature 
… not having used it before.
The copy Pose attributes doesn’t seem to work on a bone that has been keyframed. Is it supposed to?
I was testing it with the new NLA features http://blenderartists.org/forum/showthread.php?t=81488, for use with an “Offset” bone.
E.g. if I select the OffsetBone, then SH-Select the Torso bone, and press CTR-C / (choose Location), the bone DOES “jump” (locally) to the same coordinates as the “target” bone (Torso). If I then keyframe OffsetBone, then advance the frame, move Torso, keyframe it, then select OffsetBone, SH-select Toros, press Ctr-C / Location, it doesn’t copy the coordinates.
Mike