i do think they know how many people use AdAware; it was into the millions when they took over the development from ..... (can't remember his name right now) out in Silicon Valley. i went over to Spyware S&D some time ago, but was kind of put off by the caveat, something like; "don't blame us if this thing crashes your computer...", or something close. Several AO'ers have said it's great, but then i'm not in the mood to rebuild my main 'puter right now.