For spell use I much prefer the idea of using a spell point system like the one detailed over on Hypertext d20 SRDTM.
Using a spell point system allows casters to more freely pick and choose which spells they cast each day.
Every spellcaster has a reserve of spell points based on class and level. Characters also gain bonus spell points from a high ability score (just as a normal spellcaster would gain bonus spells from a high ability score). These spell points provide the magical power behind the caster’s spells: He spends a number of spell points appropriate to the spell’s level to cast the spell. Once spent, spell points are expended until the caster has sufficient time to rest and prepare new spells.
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