
DonDuckie |

3rd party feat: "Improved caster level" gives +4 caster level up to HD to all caster levels.
Inner Sea Magic introduces Guilds where at 5 Fame you get +1 CL to one class, and at 35 Fame it becomes +3 to that class and +1 CL to another class (these also increase number of spells per day and spells known.)
If there is a trait, it would probably be no more than +1 CL.
oh yes - and an Ioun stone; orange prism

Scott Wilhelm |
If you are a Tiefling your caster level = character level with respect to the effectiveness of your magical darkness.
If you multiclass in classes that all have Familiar, your class levels stack with respect to your Caster Level with respect to your Familiar abilities.
Same with Animal Companion and Mount. If you can declare your Cavalier Mount to be your Druid Animal Companion, and your Druid and Cavalier levels stack.

Gisher |

I don't think he is just trying to increase his caster level. I believe that he is trying to add caster levels from two different classes. For example, a Wizard 3/Cleric 4 casting a spell as if his level was 7.
And as far as I know, the only time you add caster levels is for prestige classes that advance your casting. For example Sorcerer 5/Dragon Disciple 4 casts like an 8th level Sorcerer.
If there was a trait or feat that let you do this, it would be the first thing listed on every Mystic Theurge guide.

UnArcaneElection |

Magical Knack is kind of like what you're asking for.
That does increase your caster level in one class (you have to pick which one when you take the trait) by up to 2 levels (capped by your hit dice), but it doesn't increase spellcasting progression. Not bad for a trait, but Pathfinder has no corresponding feat that does more.

cerhiannon |

So does Magical Knack(your sorcerer class) mean for instance if you have a character who is a level 2 paladin, level 1 oracle and level 3 sorcerer that your cl for sorcerer spells is 5?
Yes exactly that. Your other class levels don't even need to be in caster classes, you could have a Sorcer 3 / (basic CRB no archetype) Fighter 2 for example and your Sorcerer caster level would 5. Even if it was say Sor 3 / Fighter 17, your Sorcerer caster level would still be 5.

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So if I also got this I could raise my CL on the oracle side as long as I didn't pass the total character level right?
"Inner Sea Magic introduces Guilds where at 5 Fame you get +1 CL to one class, and at 35 Fame it becomes +3 to that class and +1 CL to another class (these also increase number of spells per day and spells known.")

UnArcaneElection |

So if I also got this I could raise my CL on the oracle side as long as I didn't pass the total character level right?
"Inner Sea Magic introduces Guilds where at 5 Fame you get +1 CL to one class, and at 35 Fame it becomes +3 to that class and +1 CL to another class (these also increase number of spells per day and spells known.")
Yes -- just remember that the Guild stuff that you're mentioning (which is apparently not available online) does more than Magical Knack (which as noted above only increases caster level, but not spellcasting progression). Magical Knack can only be applied to 1 class (and since it is a trait, you can't take it more than once, and no other trait does the same thing, and even if one did, it would probably be a Magic trait, meaning that you couldn't take both(*)).
(*)Possible partial fix, although this hasn't happened yet: Introduce a Campaign, Faith, or Religion trait that does the same thing as Magical Knack -- then a character could take both and apply them to different spellcasting classes, and Mystic Theurge would become semi-viable again.

BretI |

Inner Sea Magic introduces Guilds where at 5 Fame you get +1 CL to one class, and at 35 Fame it becomes +3 to that class and +1 CL to another class (these also increase number of spells per day and spells known.)
If I'm reading the Additional Resources correctly, none of that material is allowed for Pathfinder Society.
Bummer.