As if X-10's new "popunder" ads on the N.Y. Times web site and elsewhere weren't annoying enough, the company now lets you opt-out of the annoying ads -- but you have to let them place a cookie on your hard drive in order to opt out. (Actually, they'll put a cookie on your hard drive when you visit their web site, whether or not you opt out.) Yet another argument for an opt-in rule, if you ask me.