What are you trying to learn? The HMC book, like the DVX book is intended to be a simple, easy to understand camera manual for learning all of the strengths and weaknesses of the camera, and the HMC book does a GREAT job of that - I can't think of another guide out there that can top it, frankly. Are you looking for more information on filmmaking? Editing? Camera work?
Basically i need a good book to go over filming concepts.
focusing, knee, gamma, white balance, etc etc etc etc ... all the techincal stuff
I just need to refresh alot of things I've forgotten since I stopped filming and just edited.
Now its the other way round
I have editing under my belt. It filming that i need to update
The HMC book covers scene files pretty thoroughly and I doubt you'll find a better resource regarding Gamma, WB, Knee, and pedestal settings pertaining to the HMC40 or HMC150.
For filming concepts, theory, and technique guidelines, look no further than the "DP's Bible" aka the American Cinematographer Manual from ASC (which Barry quotes a number of times in the HMC book and the HVX200 book). For lighting design, see also the Set Lighting Technician's Handbook.
I totally echo Jason's recommendations. Those two books need to be on every cinematographer's shelf. Harry Box's book tells you everything in the world to know about fixtures, electrical, and gaffing; and the American Cinematographer's manual is... well, it's just the collected wisdom and reference material that the ASC thinks its members need to know, so ... yeah, everyone who shoots should have and devour both of those.