You should also sign up for the NTDEV OSR List.
If you're making a File System driver, the IFSKIT is a must (from MS), or the OSR FS KIT (very expensive though).
For reading, I also recomment Gary Nebbet's Native API Reference... a lot of it is in the IFS kit, but it's 800$. The book is only ~120$.

Best regards,
Alex Ionescu
Relsoft Technologies
http://www.relsoft.net