Widgets + ShortCode responsive to embed youtube in your sidebar or in your content [youtube video=...], with SEO http://schema.org/VideoObject fields.
YouTube embed plugin. Customize a YouTube embed with your own annotations, links, and controls. YouTube fans will see YouTube in a unique way!
Create annotations in your content.
Turns footnotes into sidenotes, magically aligning each note in the sidebar next to its corresponding reference in the text.
Allows you to add textual annotations to prettyPhoto popup images.
Image Annotations plugin lets readers to leave annotations to the selected area of the image in comments.
ByTheWay is a WordPress plugin providing shortcodes for collapsable annotations.
Rollerblade - a dead simple way for your clients to leave visual feedback on your WP site, creating information-rich tickets for you to track reports.
Annotate any text in a blog post and add a comment to it.
Your readers are your most powerful editors! Add Edit Huddle to your blog and start receiving corrections from your readers.
Fragmentions allow linking to document sections on WordPress sites using words or phrases.