Diigo is partly a social bookmarking service like Yahoo’s Delicious, and partly a notation or commenting tool like the new Google Sidewiki. Like a bookmark, it gives me easy access to important sites I’ve discovered in the past. Like a highlighter pen, it lets me highlight points of interest in an article – now in multiple colors. Like a regular pen, it allows me to take notes on a web page. It consolidates all of this in my library on the Diigo website, allowing me to organize the information by list or tag, and share it with my friends and colleagues so we can collaborate.
