Also you can check out:
SHAKE 4
Marco Paolini
(excellent book, although of course it is just like seeing just the tip of of the iceberg that is Shake)
ENCYCLOPEDIA OF VISUAL EFFECTS
Damian Allen and Brian Connor
(excellent Shake/compositing cookbook)
And I can also recommend the Gnomon Shake DVD series by Matt Linder and Gary Jackemuk (very comprehensive covering keying, rotoing, tracking, transforms, color correction, and although I took notes during the Expressions and Macros section in the last DVD, I mentally went on a holiday during the Unix Scripting/Unix Command Shell bits, but it might be something eventually you might be interested in).
I found that I started making real progress on learning Shake by using it in real projects and shooting experimental visual effects shots. Then you can go back through the manual and figure out what each node actually does; yeah, it does take time!
For further explorations into the world of compositing I can also highly recommend Steve Wright’s books: COMPOSITING VISUAL EFFECTS: ESSENTIALS FOR THE ASPIRING ARTIST & DIGITAL COMPOSITING FOR FILM AND VIDEO. Also:
FILMING THE FANTASTIC: A GUIDE TO VISUAL EFFECTS CINEMATOGRAPHY
Mark Sawicki
EXPLORING VISUAL EFFECTS: FROM STORYBOARDS TO MINIATURES & COMPOSITING-VISUAL EFFECTS THEORY, PROCESS AND PIPELINE
Billy Garfield Woody II
MATCHMOVING: THE INVISIBLE ART OF CAMERA TRACKING
Tim Dobbert
(I’m working through this one right now)
[DIGITAL] LIGHTING AND RENDERING
Jeremy Birn
THE HDRI HANDBOOK: HIGH DYNAMIC RANGE IMAGING FOR PHOTOGRAPHERS AND CG ARTISTS
Christian Bloch