SniperRyan - 9:28 pm on Dec 12, 2005 (gmt 0)

I think you can see it for terms relating to the PHP worm that went around, but I have run into it because of my search habits.

I was doing some competitor research one day and I had 10 instances of Optilink running backlink checks, as well as opening the first 10 results in tabs and checking their G backlinks, PR, etc. using the SEOpen extension.

I also use Fasterfox, which is supposed to cache the linked areas from your current page for faster browsing. All of those together seemed to make Google think I was a robot.

I have also "broken" Yahoo in this way. Both of the bans cleared up after leaving them alone for 20 minutes or so.