dragoner
KosmicRPG.com
Hitpoints aren't metagame at all, they are abstract. abstractions are required for the game to function, or you'd spend vastly more time simulating a single sword swing than most sessions last. Further, actually playing the game can't be metagaming so thinking about or using hitpoints is just playing the game.
RPGs have developed this weird idea that metagaming is anything outside the fictional mental state of the character. This is useless as a concept because it presupposes a one-true-way of playing and also moves actually playing the game into the metagame. Metagaming, by definition, is thinking outside the game, not playing it or using abstract mechanics. Metagaming is making sure the party covers all roles, or that someone plays a cleric, or how modern chemistry works. Not hitpoints.
I disagreed when [MENTION=6785785]hawkeyefan[/MENTION] said something similar upthread, but things had moved past that by the time I could respond.
It is metagaming, it's just a strict definition, too strict in that we deal with some metagaming to play, it is just that sometimes there is too much, or it appears in places we don't want it, or feel it doesn't belong. It's what the argument about metagaming is about, except it comes down to different horses for different courses, which isn't necessarily satisfying.