>>it would be a mighty blow if MS caused
Adsense ads not to appear by default. <<

There's some people who say Google adsense spam should be treated in
exactly the same way as pop-up / pop-under windows. Maybe Google
toolbar 3.x will have a "Block Adsense" button along with block pop-up
option.

MSN and Yahoo already seem to demote sites that have adsense or only
list the home page. It would be ironic if the web owners showing
adsense or overture/yahoo ads become the next battle ground in the SE's
war with each SE trying to kill off their opponants web owners adverts.

Jack