Annoyed by the rampant X10 pop-up ads that seem to be everywhere? Thankfully, it's just an aggressive campaign, arranged with the web sites you visit just like any other ad. (The alternative, I've recently discovered, is the possibility that it's adware: ads snuck onto your computer, opening with web sites to pretend that they were legitimate.) X10 has realized that people are reacting negatively to this aggressive campaign, and has a FAQ about the advertising-- including a special link that will suppress the ads for 30 days!
QJason hypothesizes that you can modify the X10 opt-out URL to set for a longer period than 30 days.