Increase your effective Caster Level
Orange Ioun Stone: +1 Caster Level
Create Magic Tattoo (Spell, Spell Compendium): +1 Caster level
Ring of arcane might : +2
Prayer bead: +1
Practiced Spell Caster +4 caster level
Spell Penetration: +2 Caster Level (caster level checks only)
Spell Penetration, Greater: [stacks with spell penetration]