Am just beginning to sort this out, but am noticing that w/ some of the "free" domain marketing tools, there comes a price: Spyware. Alexa is a great example. Go to their site or use a toolbar that has Alexa on it, and you end up w/ Spyware on your computer. Am also trying to trace the source of other spyware including "Purity Scan" and "SAH Agent". I recently went to a members site, noticed 2-3 pop-unders and ran a Spyware check. Resuts showed 10 new Registry entries and several new files. Might be good to consider Spyware potential when adding new affiliates or PPC's so as not to alienate your audience.