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2.4

• Added 'in_cats' parameter.
• Added 'in_same_meta' parameter.
• Added 'return' parameter to specify what should be returned from the function.
• Added 'date_format' parameter for customizing the %date variable.
• Added %title variable to 'format' parameter.
• Added option to sort on custom fields as integers rather than strings.
• Primary sort column defaults to 'menu_order' if Post Types Order plugin is installed.
• Many documentation updates to address frequently asked questions.

2.3

• Added 'in_same_author' parameter.
• Added 'in_posts' parameter.
• Added 'post_type' parameter.
• Added option to specify a custom taxonomy with 'in_same_tax'.
• Added new format variable (%author).
• Added variables (%title, %date, %author) to custom tooltip text.
• Added option to suppress the tooltip completely.
• Renamed filters for compatibility with Post Types Order and other plugins that attempt to filter the output of get_adjacent_post.

2.2

• Added option to retrieve the first/last post links.
• Added support for post formats.
• Improved support for custom taxonomies.
• Added 'tooltip' parameter to specify custom tooltip text.
• Added %meta variable to the format parameter.
• Ground-up rewrite of the 'ex_cats' functionality, with three exclusion methods for greater control over the navigation stream.
• Added 'ex_posts' parameter to exclude individual post IDs.
• Added option to return the next/previous links as a PHP string.

2.1

• Added 'order_2nd' parameter for specifying a secondary sort column.
• Updated the documentation to address PHP 4 incompatibility problems.

2.0

• Full WordPress 3.0 compatibility, including custom post types.
• Rewrote the plugin using wp_parse_args to simplify the function calls.
• Added option to sort the next/previous links on custom fields.
• Added option to return multiple next/previous links.
• Fix for custom taxonomies.
• Added %category variable to the format parameter.
• Added 'before' and 'after' parameters.
• Added support for post thumbnail sizes.
• Added 'echo' parameter.

1.1

• Added truncate link title and loop options.
• Added support for post thumbnails.

1.0

• Initial version.