for some time Jim Gettys on his blog is writing a lot about problems caused by buffers, queues and other congestion avoidance mechanisms. you should really read them up - specially, if you’re from this group that believes big buffers solve all problems, and encountering drops is absolute evil. nowadays it should be treated as absolutely normal thing - in most of the real life cases.
on the upcoming, sixth PLNOG we may be able to tackle this problem (if there will be space in agenda), and have a shot at myths and legends related to network QoS. and yes, agenda will be out there soon, we’re just closing down last preparations.