the google toolbar, available free at google.com, also has a pop up killer that counts score. It also ads a handy google search box to your browser, and it will highlight search terms found on a website for you.
It is actually best to run both of them, the big weakness with relyung soley on Spybot is that they does not update their database very often but Adaware updates theirs almost daily. For this reason, Adaware will always find spyware that Spybot will not. Spybot is still good to run, especially since it has blocking capabilities.