My QoS exam has been schedule for this Thursday 2/4/11. My means of studying have been the cisco press book, CBT Nuggets, and moderate labbing. I wish I had more real world experience with it, but there is just not a need in the environment I work (high bandwidth, mostly switching) for anything complex. I'm currently using UCertify's QoS testing engine to help me prepare.
With this exam I will be happy if I pass, I'm not aiming for anything sky-high. I'll be shooting for the moon with CIPT2 and CVOICE and TVOICE, but QoS seems to have hit me on a blah point. Mainly because my modern high-speed networks, I don't see much of a point of it until you get to the service provider or some really cramped T1's. Regardless, I CAN configure it, even if I don't want to... I guess thats the point.
Wish me skill and competence 

 and a little bit of luck.
Update:
Passed with a 964! I did not see that score coming. I did much better than I thought I did. Two down, three to go!