For the last couple of months, I'm seeing this message least once a day when using Google: Our systems have detected unusual traffic from your computer network. Please try your request again later. It used to say something about "automated requests", but I guess they've changed it recently. Anyhow, I can't figure out why this is happening; oddly, it only seems to happen when using Safari (5.0.2). I tried switching to Firefox for a couple of days, and didn't get any of these messages. Any advice?