I wouldn't recommend using it for anything that needs longevity, but this has been around for a free years: http://marker.to/ http://marker.to/ I used to use

I wouldn't recommend using it for anything that needs longevity, but this has been around for a free years: http://marker.to/ http://marker.to/ I used to use a service called "yellow hilighter", but it died and all my links broke, so fair warning :)