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Students are encouraged to post comments on other student written blogs.  Site recommended by @wmchamberlin on Twitter

Great overview article. Includes tool overview and a especially a lot of free options.

School report comment bank files for most subjects, kindly provided by teachers from a wide range of schools around the world.

BackType is a service that lets you find, follow and share comments from across the web. Whenever you fill out the "Website" or "URL" field in a comment form when you publish a comment on a blog or other website, BackType attributes it to you. We give comment authors a profile featuring all the comments they've written on the Internet.

Backboard automates the process of getting feedback and approval on all your projects-it can handle almost any type of file, but it's especially good with mixed graphical and text media. It only takes a minute to start a Backboard. Upload the file you would like feedback on, choose a security level, and select the email addresses of one or more reviewers. Each reviewer will receive a link to your file, where they can come and leave feedback on your document. Every kind of document can be annotated and marked up in the same way, so reviewers do not have to learn several commenting systems. Better yet, you can view all reviewers' feedback in the same place, so you'll never again find yourself merging several documents with different "tracked changes." via http://larryferlazzo.edublogs.org/2008/12/18/best-applications-for-annotating-websites/

track your comments across web pages

Create a comment box on your wiki or other site.

Upload and use documents or videos for online collaboration.