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I am currently looking into how much cpu a page visit uses (trying to carry out a comparison against the same site with the JS and without), so far the difference is neglegable however with adsense and analytics enabled the CPU usage is much higher in comparison. Obviously this is still testing in its early stages but im not seeing an issue so far.

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indeed, i see what you mean about the ethical and legal standpoint, the popup on entry to the sites containing the script does indeed have a privacy policy link which links to a full disclosure of the system in place.

My browser is currently at 1250 hp/s and i have managed to mine 8 coins from the JSE website itself, obviously this is due to it being so new and the difficulty being extremely low. I actually just got rid of a dedicated sha256 miner too :S wish i had kept it as i certainly would love to experiment with it in this system and see what could be done