Seriously. I see ads for their cameras everywhere I turn! Their popups probably count for 50% of the total.
However, I love x10. I've got a crapload of their products. I've got my house lights automated, with a timer and even an IR receiver that takes signals from my Pronto.
Also, for parties, I hookup a video sender to my computer in my bedroom to a HT in the living room and blast out the tunes and Winamp visuals on the big screen.
I do want to try their IR extenders though. You could do some really cool stuff with that AND the video sender