WordPress.org

Author: Eddie A Tejeda

digress.it lets you comment paragraph by paragraph in the margins of a text

• Floating Comment Box: Comment box not only stays with you in the right margin as you scroll, but you can resize and position it anywhere on the page. Expand and collapse comment threads by clicking paragraphs, or by selecting from the in-box menu.
• Configurability: Choose from a variety of settings for presenting table of contents of your doc, plus appearance and mobility of the comment box. digress.it comes with its own default theme but already works well with a handful of popular WP themes. Help us expand that number!
• Trackable discussions: four types of RSS feeds: full site, individual page, individual paragraph and even individual commenter.
• Real-Time Notifications: See other readers' comments appear in real time without having to refresh the page.
• Uber-addressability: Permalinks provided for each paragraph and comment. Reference from elsewhere, or cross-reference from within.
• Paragraph Embedding: Embed paragaphs YouTube-style on other sites. (Hey Ted Nelson!)