Email Log WordPress Plugin, allows you to log all emails that are sent through WordPress.
Twitter Goodies WordPress Plugin will generates nice twitter widget in sidebar area.
You tube with fancy zoom is a media viewing application that supports webs most popular you tube video. This is a jQuery based fancy zoom.
Embed status updates from Twitter into blog posts and pages
AnonPost allows anonymous user to write their own posts using special page, no access to WP panel is needed.
AJAX Thumbnail Rebuild allows you to rebuild all thumbnails at once without script timeouts on your server.
This plugin dynamically creates an XML feed that complies with the XML Sitemap protocol. There are no options to be set and the feed becomes instantly available after activation on yourblogurl.tld/sitemap.xml (or yourblogurl.tld/index.php?feed=sitemap.xml if you do not use a fancy permalink structure) ready to be submitted to search engines like Google, Yahoo, MSN, Ask.com and others.
GD Star Rating is post, page and comment rating and review plugin for WordPress. Plugin supports different image sets, rating moderation, vote rules, time restricted voting, templates, trend calculations, multi ratings, templated rendering, has a widgets build in and extensive shortcode support. Plugin can be integrated with comments for making a review website.
GD Press Tools is a collection of various administration, SEO, maintenance and security related tools. This tools can be integrated into the various WordPress admin panels, can perform maintenance operations, change some aspects of WordPress, see detailed server settings and information.
WP Archive-Sitemap Generator plugin generates simple Archives/Sitemap based on your sites/blogs posts and pages. This is not another XML sitemap plugin, but rather a nice sitemap generator.