Lizard said:If you're building a swordmage, it makes sense.
So here's a related question - what about multiclassing to fighter? I'm assuming from the write-up on multiclassing that was on Wizard's site a while back that you don't automatically get the armor proficiencies of the fighter class if you multiclass to it - is this correct? (I'm assuming it must be because if not it pretty much wipes out the need for the entire armor proficiency feat chain, but I'd like to know).