Umbral Domains: Mage
Canon Compatible
New/Revised Powers
Alternate Spheres
Spheres (version 1) - One attempt at a revised Sphere system (still in progress).
New Rotes
New/Revised merits
Other Assorted Stuff
Rules
Two Step Casting for Mage effects - Based on the the Changeling Morphean Arts system.
Settings & Setting Elements
Canon Incompatible
Powers
Rules
Settings
Recommended Reading
White Wolf
I know that technically all canon material should really be recommended, however the books indicated below are the ones that have been most influential in creating [Umbral Domains] material. Books are listed in order of percieved importance:
Mage: the Ascension. Revised ed. Brucato, Phil, et al. White Wolf Publishing Inc. 2000.[1]
Sorcerer. Revised ed. Hubbard, Conrad, et al. White Wolf Publishing Inc. 2000.[2]
Guide to the Technocracy. Brucato, Phil, et al. White Wolf Publishing Inc. 1999.[3]
Technocracy Assembled 2. Cenczyk, Mark and Phil Brucato. White Wolf Publishing Inc. 2000.[4]
Other Publications
0X - Piers Anthony
Imagica - Cliver Barker
High Sorcery - Andre Norton
Darwinia - Robert Charles Wilson
Other Media
Film
The Matrix
The Lathe of Heaven
Dark City
Butterfly Effect
Intacto
Hellraiser IV: Bloodlines (no previous experience with this series necessary)
Phantasm IV: Oblivion (no previous expierience with this series necessary)
Spirit of Wonder: the Movie
Primer
Serial Experiments: Lain
Yeelen
Pi: Faith in Chaos
Onmyoji
Neon Genesis Evangelion
Links
Mage Page - One of the older Mage websites out there, with a comprehensive array of topics and ideas, including both the canonical and brilliantly non-canonical.