I'd like to see more in the "House Rules" area, variations on the standard rules that others have used to enhance their roleplaying experience.
Words of Power is a great idea; I'd also like to see some sort of spell weaving rules.
Bloat mages, blood mages.
Also, I've seen systems that use a progressive learning system for spells, i.e., you would have to learn Spark before you could learn Burning Hands, and then you could learn Burning Arc or Flaming Ball. Maybe that's too close to the various schools of magic, but just a thought.
I'd also like to see some campaign specific material for Osirion adventures, quests, various themes for a phaoric setting.
I haven't had a chance to completely go through the vast amount of SGG material out there, so if I mention something already available, sorry.