The issue of Dragon is #318. Here are the Living Construct details:
* has a Con score
* normal vision only (no darkvision, etc.)
* is affected by spells that target living creatures and constructs
* can be 'healed' by both cure and repair spells, but healing spells only cure half
* cannot heal damage naturally
* not immune to mind-affecting stuff
* immune to poison, sleep, paralysis, disease, nausea, and energy drain
* not immune to necromancy or death affects
* can go below 0 hp like normal characters, although it becomes 'inert' instead of 'dying' and doesn't continue to lose hp
* subject to critical hits, nonlethal damage, ability damage, ability drain
* does not eat, sleep, or breathe, but can still use potions
* immune to fatigue and exhaustion (hmm, go warforged barbarians!)
* can be raised or resurrected
Warforged as a race also get +2 Con, -2 Wis, -2 Cha, +2 armor bonus (and can't wear armor, but can take feats that improve armor bonus), Light Fortification (as the armor special ability), and a 1d4 slam attack.