Wired magazine has an article about the Senate Comittee meetings on Spyware. Got a gem of a quote
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> One purveyor of pop-up ads said his software was actually less intrusive than traditional advertising methods because it does not rely on databases that amass personal details about consumers.

Consumers know when WhenU.com's pop-up software has been installed and can uninstall it easily -- as 80 percent of those who downloaded it have done, said company president Avi Nader.

Burns seemed convinced by Nader's testimony, and said business groups would need to define unacceptable behavior to pinpoint the problem.
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Read more here Wired Magazine - Your Privacy vs. Their Profit