As Larry Ferlazzo’s shares in his blog,
The ability to annotate webpages — the equivalent of making notes on a written text — is absolutely critical for students to develop their reading skills. Using “post-it” notes on text to demonstrate the use of reading strategies is a key teaching and learning approach I use in the classroom. I am always searching for web tools that will allow students to do the same on Internet pages, which is why I created the The Best Applications For Annotating Websites.
There are some good tools on that list, but Blerp, I think, “trumps” all of them.
Check out his blog for more information.