Adds a tell a friend, Share/Bookmark/Email/Social Bookmarking button.
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jadedcoder Sticky Permalinks
Keeps a history of your permalinks no matter what changes you make on your site, and redirects old links to the new ones.
Tiny Link
Get an alternate TinyURL link for your article or post permalink.
AutoLink
This plugin takes delimiters and replaces them with links using the GoogleAPI.
Bug Links
Filters commonly used references to bug numbers into active links, with (currently hardcoded) support for numerous Free Software projects.
Blog Control
Blog Control helps to avoid the common operations blog’s owners do when adopting
a new template: add scripts from mybloglog, google analytics, adsense
KB Linker
Looks for user-defined phrases in posts and automatically links them to specified URLs. Example: Link every occurrence of “Wordpress” to wp.org.
Linked
Automatically adds tags to emails, urls, Post/Page/Category Titles and any other keywords you setup.