I never was able to get it out--it would seem, after opening the diff up, that the snap ring on the end of the shaft has become wedged or will not compress to release the shaft from the differential. I ended up disassembling the shaft and replacing the boot, since that was all that had gone bad (no noises from it, just throwing grease out and wasn't dry).
I was expecting it to come out easily as well, as I have taken several cv's out of various vehicles. But Murphy's law seemed to have it out for me this weekend. Also, you can find a 1/2" drive 14mm hex key at CarQuest--but it's to long for a socket wrench, I ended up using a 14mm wrench to turn the drain plug.
I tried all of the above methods and was unable to remove it from the differential. I'll probably end up having to take out the diff someday and seeing what I can do to remove the half shaft with the differential out of the vehicle.
Everything else was cake to take care of, just had the one issue.
silver '06 4.7l, leather, no sway bars, BFG A/T with MTR tread (TreadWright) 265/70/17, 1.5" spider trax, get lost 4x4 front bumper and rock sliders, custom lift (OME front springs with spacers, 2.25 RR in rear)