Amazing Gestalt combinations!

[Greenish]

Duskblade is technically a spellcaster, but it's more of a fighter with buff blast spells instead of feats

Fixed that for you. Duskblade has very few buff spells. (Greater Magic Weapon and, uh, Swift Flight?)

[Snake-Aes]

What has a lot of good Int synergy that doesn't have spells? Or psionics?

Aside from Warblade/Factotum//Swashbuckler

Define "synergy". Skill points are always there...

[NineThePuma]

I'm considering a Daring Outlaw//Warblade/Factotum build already; I'm debating what to push further with.

[Prime32]

What has a lot of good Int synergy that doesn't have spells? Or psionics?

Aside from Warblade/Factotum//Swashbuckler

Make that Warblade/Swashbuckler//Factotum. Swashbuckler is a three-level class.

[Morph Bark]

What has a lot of good Int synergy that doesn't have spells? Or psionics?

Aside from Warblade/Factotum//Swashbuckler

Artificer.

Make that Warblade/Swashbuckler//Factotum. Swashbuckler is a three-level class.

Getting Swashbuckler up to 3 first seems a better idea, since you'd start with higher initiator level. If you could add another level from another class in there that fits real well, you can go into Warblade 1 and pick several level 2 maneuvers. Yum.

Even if you don't take that extra level it might be good anyway.

[sambo.]

Side 1: Sorcerer15/Abjurant Champion5 (take archmage if allowed to PrC alongside Arcane Duellist)
Side 2: Paladin2/Arcane Duellist10/insert as much 1-2 level-dip cheese as your lactose tolerance and DM allow (a bit of Barb could be good fun).

i'd choose a thumping great 2h weapon with a big critical threat range, get Improved Critical, Power Attack and Arcane Strike.

you now have a Gish that can throw spells around like a full tier 2 caster and can also whack an AMF around themselves and be a top-notch melee guy and just happens to have ludicrously good saves across the board thanks to Divine Grace (Cha to saves).

at least. that's what i'd build if could find a gestalt game.....