
Several anti-spyware firms, including Aluria, Lavasoft, and PestPatrol, have quietly <A HREF="http://news.yahoo.com/news?tmpl=story&u=/pcworld/20050531/tc_pcworld/120914">stopped detecting adware</A> from companies like Claria and WhenU--a process called delisting. Those adware companies have been petitioning anti-spyware firms to delist their software; other companies have resorted to sending cease-and-desist letters that threaten legal action. In most cases it's difficult for customers to determine whether their anti-spyware tool has delisted anything and, if so, which adware it skips.