I don't think it'd come close. Here's my napkin calculations: Let's say you pay $5CPM - $5 for every 1000 views. Let's say every viewer stays on the page for

I don't think it'd come close. Here's my napkin calculations: Let's say you pay $5CPM - $5 for every 1000 views. Let's say every viewer stays on the page for a minute, and every viewer is able to provide 10 MHash/s, which I think is pretty generous for a Javascript based miner. That means you get a minute of 10,000Mhash/s for $5. The Mining Factor 100 is currently 0.17 USD/24h@100MHash/s (http://www.bitcoinx.com/profit/ http://www.bitcoinx.com/profit/). That works out to be about $0.0047 in return for that $5. My numbers are probably off, but I think it's still a couple orders of magnitude from being profitable. Even if everyone was running a top-of-the-line GPU, and you were able to squeeze 500Mhash/s out of everyone, it'd still just be about $0.24 for every $5 spent.