DV Magazine's March issue features a overview of gamma-corrected compositing by the venerable Meyers. Thanks to Chris and Trish for the shout out to eLin, and for boiling down the evangelism portion of the eLin docs into a very readable two pages!
Trish and Chris Meyer are the authors of the undisputed bibles of After Effects:
Creating Motion Graphics with After Effects
Volume 1: The Essentials
Creating Motion Graphics with After Effects
Volume 2: Advanced Techniques
After Effects in Production:
A Companion for Creating Motion Graphics
Highly recommended!