Don't forget people who may have * installed UserScripts / GreaseMonkey scripts * Browser plugins other than Google Toolbar which may send stuff to the big G *

Don't forget people who may have * installed UserScripts / GreaseMonkey scripts * Browser plugins other than Google Toolbar which may send stuff to the big G * (Self-)modded browsers which send out stuff to wherever...the list goes on and on indeed. Best thing to do to keep a site secret: * Don't host it on the internet (d'uh) * Hide behind a portal page and have that and your server weed out misconfigured / hijacked browsers before any can proceed to your real secret site (also see web cloaking).