Well I think that you've done a very good work on NCM. Posting a comment isn't easy because it's so customizable that I've all that I've ever wanted....I need time to learn how to customize NMC on my needs (skinning & c.).
I can say that I've encoutered some strange behaviour on alpha 1 (need to read more threads on D3Frontend) and the default skin needs too much attention when changing volume due to small and center-placed buttons (I can solve this with a skin).
I would like a embedded gamma control feature ...
That's all I can write about NMC, you'd feel very proud of your work.