Well, we don't know that Noah was dead -- he was just shot in the face. While that normally kills you instantly on TV I think people regularly survive it for a li'l bit.

But his eye was all cloudy, and then it cleared as he revived. That says "dead" to me.

I wonder if they hooked Noah's corpse up to life support to make his heart beat and carry the blood transfusion throughout his system.

I was wondering how it worked, and then I remembered watching Six Feet Under. And I presume if they can replace your blood with embalming fluid after you're dead, they can just as easily give you a post-mortem blood transfusion.

As to the blood - the Company probably has vials of Adam's blood stashed away ... just in case.

From that EW review:

I remember when Star Wars: Episode I came out. A bunch of us here at the office were talking about it, and former EW executive editor Mark Harris said something to the effect of ''It's kind of amazing that George Lucas' saga is actually about the redemption of the bad guy.'' And he was right. It is kind of amazing. Watching this episode, I thought the same thing to myself: How amazing would it be if Heroes was all about Noah Bennett, the bad guy who tries to redeem himself — even if it costs him everything and everyone he's trying to redeem himself for?

You know, I'd actually kind of like to see more flashbacks of Bennet when he worked for the Company, like in "Company Man." I'd be interested in seeing what he was like back when he was, you know, kidnapping twelve-year-olds. I'm not sure it would make me dislike him, and I'm actually not sure that he's changed all that much: like Bob said, he is, and always has been, fiercely loyal...to his daughter, not them.

A gun shot through the eye can be occasionally survivable with prompt medical support, but it usually results in massive brain damage, so I'll handwave that they medevac'd HRG to a secure facility and gave him a transfusion just before unhooking him from life support, et cetera.

Until they canonically state that Claire's blood is so potent that it really can bring back the (other) dead.

At any rate, I'm left wondering, WHY exactly would the Company bring back HRG? It's not like they like him or anything.

Maybe they want Claire?

WHY exactly would the Company bring back HRG?

Reanimated dead guy = eating brains = quick and easy way to replicate Sylar in a lab setting?

Maybe Mohinder and not the Company is behind HRG's reanimation?

I think HRG was dead. He had that Criminal Intent dead eyed look before his eye healed.

And I presume if they can replace your blood with embalming fluid after you're dead, they can just as easily give you a post-mortem blood transfusion.

Embalming machines pump the blood out in a pretty noisy process though. I assumed something less intrusive, like electrodes running a current across his heart.