GAs whose IT slavemasters allow them to install apps on their workstations might be interested in the new beta of the Google toolbar. In addition to putting a Google search field on your Internet Explorer 5.5 and later toolbar, the latest version (again, still in beta, so use at your own risk) has an
integrated pop-up stopper.
The link to the beta download page seems to be down temporarily, but check back
here periodically.