Here's the short version on shardminds from the sourcebooks:
Basically, they're sentient collections of crystal, held together with psionic power. In the 4e flavor, they're fragments of the Living Gate, the thing that kept all the Far Realm nasties out of the mundane world. (i.e., beholders, illithids, and their ilk) They made pretty good wizards, sorcerers, and other arcane classes, because they had high natural intelligence, willpower, and charisma. I figured that in this 'verse, they'd be more magical than psionic. Not sure if you want them to be naturally occurring or created intentionally.
Warforged are pretty much intelligent golems. They're sentient with strong soldierly tendencies, and they have equivalents to muscles, veins, and some internal organs (though they don't have any biological needs like air or food.) 3rd edition had several varieties that varied in intelligence and size (there was a giant one that had no intelligence and needed a pilot iirc) while 4e just had the humanoid race. They originated in the Eberron setting as soldiers made for the Great War. They had individual personalities and all that, basically they were a normal race, but they were made in creation forges. I figure that they would either be left behind by the old civilization and generally align with the tech civilization, or they were just plain created by the tech civilization.