For just about all my casters, first few pages are all heals related spells, the next ones are direct damage/DoT based spells along with debuffs, then buffs, then random spells that don't really fit into the other groups.
All prioritized by level and usally they are all clumped together (direct damage with direct damage, strength buffs with strength buffs, ETC.). Started doing this when I first started my shaman back when EQ first launched, that way I keep everything organized and could switch out spells with relative ease without having to dig through my spellbook to find it.
What can I say, I like to be neat with my spells
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