Fighter|Wizard works pretty excellently in 3.5/PF, though that's mostly because Wizard is just excellent. However you can still do the classic "gish" stuff just fine - armour is almost an irrelevance, after all (especially when you have Mage Armour, etc).
In Pathfinder, though, I would probably rather do something like Magus|Wizard (or |Arcanist, |Witch, |Psychic, whatever) with Broad Study - actually, you only need six Magus levels for this (which makes it impractical in non-gestalt) so you could feasibly multiclass after that - that means giving up all the other Magus goodness but since Wizard is what's powering your spellcasting it's not such a big deal. Staying for Arcane Accuracy might be worth more though, I dunno.
Magus|<martial> has obvious benefits, and Magus|Rogue can use Prescient Attack or whatever it's called to get lots of Sneak.
Obviously, Synthesist is pretty awesome - get eidolon physical abilities, plus full BAB and class features from another class (Synthesist|Monk or similar with Feral Combat Training is a bit of a favourite of mine).
Mesmerist works pretty well with Sorcerer... but then, Mesmerist is a pretty good one-level dip anyway.
Psychic is quite a nice one since with the dual stat dependency, you don't feel so bad combining it with a Cha- or Wis-based class. In fact the Self-Perfection discipline which gives Wis to AC works pretty awesomely with Cleric or Druid or whatever - no better than Monk|Cleric or Monk|Druid, except instead of unarmed strikes you get full, Sorcerer-like spellcasting. I'm playing a Rebirth Discipline Psychic | Reincarnated Oracle character in one game, and those go together pretty well thematically and not badly mechanically either.
Oracle can probably make some pretty neat martial builds using some of their Revelations, though I'm not terribly up to speed with Oracles so I couldn't really give examples.
The same sort of logic as 3.5 applies, naturally, it's just that there are some new PF classes you can throw into the mix too.