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I wanted to see how high of an at-will accuracy I could get. No regard  towards damage, defenses or survivability.
He's just gonna hit.

UPDATE: Currently at 54/56 to-hit at-will, with a reroll (+2).

Level 30 Revenant Deva|Tiefling|Human Warlock|Fighter/Sorcerer  Academy Master  Soul of the World
Background: Tarmalune

STATS:
30 Cha 15 Dex 13 Int

FEATS:
Hybrid Talent: One-handed Weapon Talent
Arcane Prodigy
Light Blade Expertise
Nimble Blade
Superior Implement Proficiency: Accurate Dagger
Reckless Charge
Reckless Curse
Arcane Familiar
Spellseer Familiar
Sorcerous Reserves
Restless Dead
Arcane Spellfury
Potent Rebirth
Hellfire Blood
Ghostly Vitality
Arcane Admixture: Fire
Darren Gambler
[one open slot]

BONUSES TO-HIT:
+15 half level
+9 charisma
+1 charge
+6 enhancement
+3 proficiency
+2 combat advantage
+1 fighter weapon talent
+3 expertise
+1 nimble blade
+1 accurate dagger
+1 arcane spellfury (hit)
+2 restless dead
+2 deva's potent rebirth
+1 spellseer familiar
+1 sorcerous reserves
+1 hellfire blood
+1 reckless charge
+1 reckless curse
+1 academy master
+1 master's blade (while in stance)
+1 barrage bracers (hit)
+1 charger's headdress
+reroll (martial supremacy)
+2 on reroll (darren gambler)

TOTAL:
56 to-hit at-will charge + reroll (+2)
54 to-hit at-will the first attack+ reroll (+2)

ITEMS:
Master's Blade Accurate Dagger +6
Shadow Warlock Armor
Life Charm
Belt of Sonnlinor Righteousness
Zephyr Boots (for flying enemies)
Barrage Bracers
Charger's Headdress

SUMMARY:
Revenant deva warlock|fighter qualifies for potent rebirth/hybrid talent (one-handed weapon talent) to use Ensorcelled Blade (when he gets it as Soul of the World) with +3 CA from SWA and +1 from fighter weapon talent. Arcane prodigy makes him a sorcerer, which qualifies for sorcerous reserves/accurate dagger proficiency so he gains +2 to all arcane attacks. Academy master and arcane spellfury give him +2 if he hits. Arcane familiar/spellseer familiar gives him +1 to hit with his familiar placed near his target. Light blade expertise, nimble blade, reckless charge gives him +5 to his attacks (on a charge). Soul of the World lets him become both a Tiefling and a Human which qualifies him for reckless curse and hellfire blood (with arcane admixture taking care of the fire requirement). Ghostly vitality is so he can survive while qualifying for the bloodied requirements of other feats, including restless dead. Master's Blade gives him +1 to hit whenever in a stance, Martial Supremacy lets him reroll any basic attacks as an encounter stance, and darren gambler gives a +2 bonus to that reroll.

I'm pretty sure I covered all the myriad requirements and  pre-requisites. He curses, stances, then charges at +52 to hit. If he hits (and he must) and continues hitting, it'll  be an at-will +54 to hit. That's enough to auto-hit Vecna, although  he'll do maybe 15 damage. Catch them by surprise, certainly, as this odd  creature swoops down for an unnaturally accurate strike only to poke  them with a sharp stick.

Did I forget anything? Miss any good alternatives? Forget to spot the  old build that did +66 at-will and actually does damage that I hadn't  noticed?

I love this game.

EDIT: Replaced Druid with Rogue, Dragonborn with Deva, Raging Drake Form for Potent Rebirth for a net increase +1. Reckless Curse dropped, one slot open.
EDIT: Added Arcane Admixture: Fire to keep fire damage while using Master's Blade for +1 to attack while in a stance. Can still drop Disciple of Inspiration if needed, as he is now practically unable to miss.
EDIT: Replaced Reincarnate Champion with Soul of the World since he lost the primal class, gained sorcerer at-will. Replaced hybrid rogue with hybrid fighter for Martial Supremacy for rerolls (for some reason) and stance bonus, replaced rogue weapon talent with fighter weapon talent for no net loss. Replaced Half-Elf with Human for Reckless Curse.
EDIT: With Tarmalune & Darren Gambler, reroll on Martial Supremacy now has +2 bonus, for an effective 54/56 to hit.

Damn, I didn't notice it was a racial feature and not something automatic. Down to +51 to hit. 

Replace it with Impending Victory for +1 against bloodied enemies.

Dropping Dragonborn for Deva would remove Raging Drake Form and add Deva's Potent Rebirth for a net of +1 accuracy and an open hybrid slot and Wild Dilettante feat slot, which we can replace with Rogue and Rogue Weapon Talent for another +1. Now we're at 53, with one feat slot open.

Made irrelevant by dropping druid/wild shape/dragonborn/raging drake form for rogue/rogue talent/deva/potent rebirth. Good to know though.

Considering dropping Disciple of Inspiration because... well, he's not going to miss, even with only +50 to hit. That gives two feat slots for whatever else might help.

Rerolls would probably be the only way to boost this.  Since you roll a 1  5% of the time, and roll a double 1  0.25% of the time.  Can you squeese avenger/Martial Supremacy?

Oh, and there's a few attacks that have built in bonuses (astral seal, careful attack).  Probably not worth it though.