I agree that this should *NOT* be turned on by default. For all of the reasons that everybody else has given. Not only do I *NOT* like having this feature forced upon me (I'd rather turn it on if I wanted it on) but, as somebody with their own Web site, I do *NOT* want to have to deal with meaningless traffic. Bad behaviour (causing unnecessary traffic) as a default on the part of a browser should not be condoned.
Jason.