Diigo is an application that lets you make a complete copy of a web page in a file. This is useful for a lot of things, such as learning how the web works and making sure that a website is up-to-date. You can easily annotate web pages, add highlights to certain parts, add your own comments and tags, and share them with others.

You can also send it to yourself via email, Twitter, Facebook, or even Google Buzz, so you can keep track of your notes and find out what others have to say.

The best thing is that you can do all this without losing the link to the web page, so you can access your notes anywhere and at any time.