Re: @Charlie Clark Description...
Charlie, do you mean that to exclude those with "extensive script-blocking" will reduce the target size?
No, I said and meant the opposite: most people don't run script-blockers and are thus easy to track using the standard methods.
Personally, I'm quite happy with Ghostery's blocking of the third party crap (all adslingers and trackers by default) but I'm under no illusion that I'm not trackable.