unregistered users can favorite a post.
BookMarkPress allows users to bookmark resources on the internet and create a searchable library of them
Put favourite posts on sidebar.
Generates a IMG tag with one of your favourites @ flickr.com.
Picturegrid shows photos from a specific set from your flickr account (or just recent photos) in your wordpress blog, with or without a lightbox.
This plugin is a replica ot 'noteworthy' plugin.
RSS link for this tag.