I use Yahoo at home, from the Firefox toolbar. I'm growing increasingly suspicious of Google (call me crazy) and for many things it's about as good.
That said, I would have no problem with banning Yahoo from HN. I've never used Yahoo to search HN, and Yahoo's "site:foo" support is one of their relative weaknesses, so I doubt I ever will. (It "redirects to Site Explorer", which looks basically like normal search but uglier and with less information.)
You could even redirect them to The Site Which Shall Not Be Mentioned.
That said, I would have no problem with banning Yahoo from HN. I've never used Yahoo to search HN, and Yahoo's "site:foo" support is one of their relative weaknesses, so I doubt I ever will. (It "redirects to Site Explorer", which looks basically like normal search but uglier and with less information.)
You could even redirect them to The Site Which Shall Not Be Mentioned.