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I am thinking that the 'white list' idea is a very good one.
If you use ModSecurity 2.x, here is a rule to serve that scoutjet user agent a 403 Forbidden page.
SecRule HTTP_User-Agent "ScoutJet" "deny,log,status:403"
I wonder how many of you that are freaking out about this are the same people who build multiple sites on the same topic to saturate a niche/serps and hide this fact via private whois because this is a violation of the ToS?
I don't understand the uproar here ... you do realize that if you search for the adsense id in many other search engines (except google), it will return you a list of matching pages right? ;-)