Pathfinder-only?
Hmm...here's what I've noted in my guide so far, though it's slanted towards conjurers over sorcerers
TRAITS
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From the Traits Guide:
Reactionary (POP: Legal): +2 to initiative. Useful from 1st to 20th. Take it!!
Resilient (POP: Legal): +1 to Fortitude saves. Best with the Academae Graduate feat.
Focused Mind: +2 to Concentration checks is very sweet.
Gifted Adept, Magical Lineage: +1 to CL for 1 spell, or -1 to metamagic costs for 1 spell. Both are limited, so make sure the spell you choose is one that you use often.
Natural-Born Leader: Eh, it's a bonus to summoned creatures, but a weak one.
Rich Parents: Start with 900 gold. This is an incredible feat if you don't expect to play the character for long.
Faction traits:
Devil's Mark (Cheliax): gain +2 to social skills when dealing with evil outsiders. Good for planar binding.
Master of Pentacles (Cheliax): 1/day, +2 to CL for determining the duration of any conjuration spell. Very versatile, and useful for a long time.
Tomb Raider (Osiran): I rate Perception highly, so the opportunity to get it as a class skill is nice.
Eastern Mysteries (Qadira): Gain +2 to the DC of one spell/day. Very useful.
Other traits:
Dropout (Curse of the Crimson Throne): +2 to Spellcraft and you dropped out of Hogwarts School for Witches and Wizards!
Religious (Curse of the Crimson Throne): +2 to Concentration checks[/spoiler]
FEATS
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Spell Focus (Conjuration): Almost certainly going to be your first or second feat, this opens up other useful feats, qualifies you for PrCs, and makes your spells better.
Augment Summoning: For any serious summoner, this is a must-have feat. I recommend getting it as soon as possible, since the bonus is static and most noticeable at the lower levels.
Cosmopolitan (PF Campaign Setting, POP: Legal): Choose 2 wis, cha, and/or int-based skills, and make them permanently class skills for you. How about Perception for surprise rounds, or Diplomacy for Planar Binding? It's like taking two Skill Focus feats for the price of one!
Varisian Tattoo (Curse of the Crimson Throne, PF Campaign Setting, POP: Not Legal): gain +1 to CL with a school that you have Spell Focus in, and you can use a cantrip (Acid Splash) a few times per day. A nifty boost.
Noble Scion (PF Campaign Setting, POP: Not Legal): You're a scion of a noble Chelish house. Thrune grants Infernal as a known language and at 9th level you gain an imp familiar as if you were a 1st level sorcerer. For the cost of a feat, you gain the best Improved Familiar without worrying about alignment restrictions
Greater Spell Focus (Conjuration): This should be a priority for conjurers interested in crowd control, and is still good for summoners after they nab Augment Summoning and other critical feats.
Improved Initiative: As a conjurer, you need to control the battlefield fast. This spell helps you do that. Highly, highly recommended.
Combat Casting: With PF, it's much harder to cast defensively. This is a decent pick if you're out of good choices later on or if your character frequently finds himself surrounded.
Spell Penetration, GSP: Decent choices, though many of your spells don't allow SR. Mostly good as filler at the very high levels.
Improved Familiar: Another solid choice, since familiars are like having a second action in a round. I recommend the imp, quasit, and air or earth elemental.
Skill Focus: If you're going for Loremaster, you'll need this. I'd recommend Spellcraft, Use Magic Device, Perception, or Knowledge (Arcana).
Toughness: The PF version is like 3.5's Improved Toughness, only a little better at the start. It's a good filler feat.
Great Fortitude, Improved Great Fortitude: Good if you have Acadamae Graduate, and once you have the first feat you might as well take the second one. Fortitude is an important save, and unlike your Will save it probably won't be very high anyhow.
Leadership (POP: Not Legal): As always this is the best feat in the game if you're up for the book-keeping. Even if your charisma is absolutely terrible, this will still be a strong feat.
Wand Dancer (PF Campaign Setting, POP: Not Legal): I don't actually recommend this feat too highly since the prerequisites are subpar (Dodge and Mobility), but this gives you Shot on the Run with a wand, which is kick-ass.[/spoiler]
