PriceGrabber announced today, quickly following a similar Major League Baseball announcement, that it would not use pop-ups, adware or spyware to market its offerings on its own site. A release said it "pledged to its users that they will not find pop-up ads or pop-under ads served by the company on its site."

The shopping search site said it would affix a logo on its pages indicating it isn't using pop-up ads, which will likely have the affect of notifying visitors that any pop-up ads they do see will be coming from installed software, rather than the site being served.

This clarification could help increase brand goodwill toward the site, but it could also undercut the use of a legal argument used in pending cases against adware firms: that the pop-ups constituted a trademark violation by inducing consumer confusion.