At about this time most nights (~9pm GMT +11) I get "proxy errors" from whatever answers as z.iwethey.org. Sometimes it takes 5 minutes before the correct pages respond; sometimes it only takes 30 seconds to clear.
I checked it was actually z.iwethey.org by telnetting into port 80 and doing a GET / HTTP/1.1 directly. I was rather surprised to get the "proxy error" page when I did that. No, I'm not behind a transparent proxy (my ISP doesn't do that).
Wade.