Clericzilla (3.5e Optimized Character Build)
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This is not the only way to optimize a divine caster, nor can it be considered the best. It does, however, produce a massively powerful character capable of fighting on the front lines at least as well as a typical martial character, and extremely deadly to undead foes.
SRD, Complete Divine, Complete Champion
 Game Rule Components
Cleric of Pelor 7/Radiant Servant of Pelor 10.
Starting Ability Scores (Before Racial Adjustments): Wis 18, Cha 15+, Con 13+, Int 10+, Str 11+
Race (Templates): [[3e Race:: Human]].
Starting Racial Traits: Bonus feat, 4 additional skill points at 1st level, 1 additional skill point every level after.
|Saving Throws||Feats|| Class
|1st||Cleric 1||+0||+2||+0||+2||Extra Turning, Persistent Spell||Turn Undead, Extend spell||Sun Domain, Planning Domain|
|3rd||Cleric 3||+2||+3||+1||+3||Divine Metamagic (Persistent Spell)|
|6th||Cleric 6||+4||+5||+2||+5||Reach spell|
|7th||Cleric 6/Radiant Servant of Pelor 1||+4||+7||+2||+7||Extra Greater Turning, Radiance, Turn Undead||+1 level of existing divine spellcasting class|
|8th||Cleric 6/Radiant Servant of Pelor 2||+5||+8||+2||+8||Divine Health, Empower Healing||+1 level of existing divine spellcasting class|
|9th||Cleric 6/Radiant Servant of Pelor 3||+6/+1||+8||+3||+8||Power Attack||Aura of Warding||+1 level of existing divine spellcasting class|
|10th||Cleric 6/Radiant Servant of Pelor 4||+7/+2||+9||+3||+9||+1 level of existing divine spellcasting class|
|11th||Cleric 6/Radiant Servant of Pelor 5||+7/+2||+9||+3||+9||Glory Domain||+1 level of existing divine spellcasting class|
|12th||Cleric 6/Radiant Servant of Pelor 6||+8/+3||+10||+4||+10||Spontaneous Domains||Maximize Healing||+1 level of existing divine spellcasting class|
|13th||Cleric 6/Radiant Servant of Pelor 7||+9/+4||+10||+4||+10||+1 level of existing divine spellcasting class|
|14th||Cleric 6/Radiant Servant of Pelor 8||+10/+5||+11||+4||+11||Positive Energy Burst||+1 level of existing divine spellcasting class|
|15th||Cleric 6/Radiant Servant of Pelor 9||+10/+5||+11||+5||+11||Strength Devotion||Turn Undead||+1 level of existing divine spellcasting class|
|16th||Cleric 6/Radiant Servant of Pelor 10||+11/+6/+1||+12||+5||+12||Supreme Healing||+1 level of existing divine spellcasting class|
|17th||Cleric 7/Radiant Servant of Pelor 10||+12/+7/+2||+12||+5||+12|
With 6 levels of Cleric, you meet the requirements for Radiant Servant of Pelor. This Prestige class continues to improve all the Cleric's abilities and gives further bonuses and power boosts to those that weren't already powered up, as well as martial weapon proficiencies. You thus reach 17th level with all the same abilities as a 17th level Cleric, plus the substantial bonuses from the prestige class. From here, feel free to take 3 levels as a Hierophant, or a Shadowstriker, or some combination of martial classes, or even round out your Cleric levels. Preparing a Reach spell lets you use Persistent spell for it.
 Munchkin-Size Me
It's Clericzilla. It's already munchkin-sized. The only question is if you want to take your last 3 levels in Hierophant for more options in spellcasting, or in Shadowstriker for some Paladin-esque abilties, or as a Ranger and Fighter for feats and favored enemy (undead), or just top out your Cleric levels and be more of a caster. This is assuming you're not going into epic levels, of course.
if you take Hierophant levels you can get the Divine reach ability which gives your touch spells a set range for Persistent spell with no increase in spell level.
 Side Notes
Pelor doesn't have access to the Planning Domain. This isn't to say this build is impossible, you just can't get some of the feats listed because you have to get Extend Spell yourself to have access to Persistent Spell.
 DM Counters
Have enemies dispel the persisted buffs. Disallow Sun domain and/or Sun-related deities. Disallow Divine Metamagic and/or Persistent Spell. Note that if you're going to do this, you might as well disallow the Radiant Servant of Pelor itself.
Woefully low Ref save makes it the perfect target for spells like Fireball and Lightning Bolt, which hit their peaks before this build does.