Boaz - 8:06 am on Jul 8, 2003 (gmt 0)

Interesting - yes. But think of the load it will put on Google to do such a check for every query - if implemented, serps should take quite a while to show up for every query - and this is not happening. So, though it could be an explanation for what we're seeing, I don't think it can be actually what is happening.