At will powers for spell casters - after all how much different is a wizard casting some blast spell each round for minimal damage versus throwing a dart or swinging a staff each round?
I like the monster classifications for minions, elite, solo.
This can be added by giving every wizard one free reserve feat (from complete mage) at character creation.
This can be added by giving every wizard one free reserve feat (from complete mage) at character creation.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.