Warlords hybrid quite sweetly too and with most classes ... depending on what you want to emphasize, i think but quite well anyway.
Warlords lose their full-blown AP feature and even if they invest Hybrid Talent into it, they can only use it once per encounter. If the goal is to be a Warlord, you lose stuff. With Swordmages, they just lose their AC feature really. Wizards lose the one class feature+ritual caster and can get both back.
i.e. you can be Warlord|Swordmage and now you have a way to boost Init for a usually challenged class at the cost of a feat. Or you can be an Artificer|Wizard with a 20 Int/14 Wis, spend a hybrid talent feat on your Orb feat, then spend another feat for Ritual Caster via Divine Secretkeeper for an extra skill too.
But you can't actually boost everyone's AP as a Warlord unless you get it from one of the A+ Leader paragon paths.