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> ever see a refund for any clicks?

Yes, all the time. Here's what it looks like in the billing summary:

The alt text for the question mark graphic: "Your account has been credited for invalid clicks that escaped automatic detection."

> Any of you that advertise with Adwords Content...ever see a refund for any clicks?

Yes

I imagine if the advertisers weren't receiving refunds they would be the ones contemplating a class action.