Wow. Google's Toolbar opt-in URL-tracking dialog has become more generic, indirect, and insistent over the years. It no longer includes the red 'yada yada' text Matt Cutts referred to last week.
On IE, it doesn't even offer a 'No' but rather an 'Ask Me Later', as if you'll have to agree eventually, so you might as well agree now. Kinda sneaky! (Do you think they A/B tested different wordings and went with the one yielding the most opt-ins?)