Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
Make e-mail notifications for new comments/pings cleaner and more readable. No configuration necessary.
Show and hide ID elements with a mouseclick. Could be used to create for example menus or menu tabs.
Add Access Keys to Category and Page navigation menus to make your website far more accessible.
wp slug will set slug by translate title to english with google translate or pinyin.
Adds a sidebar widget to display text, includes php-code capability. Includes conditional tag testing to specify where to display.
Adds simple sticky posts feature to WordPress blogs.
A login alternative to OpenID, designed for blogs and anything else you can think of!
Access Logs generate a access log file in Apache combined format rotated monthly.
Displays years/months/days since, until, or between events. Great for tracking a pregnancy (with a bar graph!), time until an election, or whatever.
Allows private posts to be shared through a special private url.