Actually, Adblock for Chrome can block ads too, but I think not all of them. It happend once Google let in by mistake some code from Webkit, that allowed for this to happen. And then they didn't remove it anymore.
Here's what Adblock's author says:
"New in version 2.0: Ads are actually blocked from downloading now, instead of just being removed after the fact!"
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Actually, Adblock for Chrome can block ads too, but I think not all of them. It happend once Google let in by mistake some code from Webkit, that allowed for this to happen. And then they didn't remove it anymore.
Here's what Adblock's author says:
"New in version 2.0: Ads are actually blocked from downloading now, instead of just being removed after the fact!"
It wasn't a mistake. A google engineer pointed it out on the chrome bug tracker saying you get this feature for free now with webkit