Here's a cool extension called marker.to
for Chrome and Firefox that allows you to highlight the text on a page. Then it offers you a link to that page so you can save it or share it with other. It puts a neat little highlighter pen icon on the top of your browser and when you come to a page you want to highlight text on just click and get to work. A little box will pop up with a URL for you to cut and paste and send to others. Neat idea.