This may be well known to many of you extremely smart techies here BUT I was playing around trying to figure out how to block those annoying semi-popups and found that, if I use IE, Tools, Internet Options, Privacy, Sites I can add them as an entry like ' http://media.fastclick.net ' (no quotes) and voila', they don't occur ( or haven't seemed to anyway).

Anyway, just a little thing I found out.