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.
Pingcrawl adds a "Possibly related posts" capability by querying Google Blog Search for post tags and pinging the results.
This PlugIn will link every [[text]] or [[alt.text|link]] with the the appropriate wiki-system or searchsystems. (Option-page in english, german, dutc …
Add HTML meta tags to a theme header when the theme is used across multiple blog-based sites, such as when using the multi-user version WordPress.
A plugin to convert WordPress URLs entered which contain Uppercase letters and 301 redirect them to the correct Lowercase URL.
A widget which allows you to add an image with a link to your sidebar.
photobucket Widget works as a widget, making very easy for you to embed in sidebars from your photobucket account!
This plugin will create a Google sitemaps compliant XML-Sitemap of your WordPress blog. qTranslate Compliant version by NeoEGM.
WPreso Video FeatureBox is a WordPress plugin that allows you to create a list of Featured Videos slides from your video posts or video category.