Integrate analytics and tracking server-side. Duh. (And if you so need window size and other easy-to-get-via-client-side-JS information, render the script into the page instead of putting it into a .js file.)

And maybe make all this optional for those that don't want to be tracked. (I mean allow them to register and opt-out of server-side tracking too.) I think they might even start to like you and become sort of loyal.