Build #1 - The Summoner (non-Malconvoker)
Archivist 7/Sacred Exorcist 1/Thaumaturgist 4/Archivist +1/Holt Warden 1/Contemplative 1/Archivist +3/Paragnostic Apostle 2
Race: Human
Feats
Human - Academic Priest
1st - Spell Focus: Conjuration
3rd - Rapid Spell
6th - Twin Spell
9th - Divine Metamagic: Twin Spell
12th - Metamagic School Focus: Conjuration
15th - Rashemi Elemental Summoning
Archivist Bonus - Quicken Spell
18th - Divine Metamagic Quicken
Playing:
One of the nice things about a summoner build is that it takes relatively few spells to make work, and having the options of both the summon monster and the summon nature's ally lines makes the archivist summoner a powerful, versatile force even before adding in the other powers of the build.
Level 1-3: the painful levels. Break out the light crossbow and stay out of the way. Use Dark Knowledge and party-wide buffs like bless to make your teammates more effective, and use battlefield controls like entangle and sleep to divide and conquer.
4-8: by this point, your summons stick around long enough to be useful. For now, mostly stick to the SNA lines, since it offers the superior combatants, and the summon monster spells don't have anything to make up for their poorer choices.
9-13: this is where the build really comes online. With Twin Spell and then Contingent Conjuration (I like to just key mine to a command phrase) you can open combat with up to three summons in the first round. Pouncers really become a strong option with Dark Knowledge: Foe adding 2-3d6 to every attack's damage. And with buffs like animal growth available, you can really sit back and let your summons take care of the combat, while you focus on battlefield control.
14-18: Now we start to add a little more diversity into the mix. By picking up domain spell slots and an actual domain, now we can play shenanigans with spells like substitute domain and anyspell to diversify the options. Summoning-wise, elementals begin to really shine for combat, and the summon monster line starts to bring really useful SLA's to the table.
19+: at this point, your archivist should really be able to do anything.