DynamicWP Fisheye Menu will build a Fisheye menu from a list of links.
Expiring Content Shortcode provides a shortcode to wrap around content, setting a date and time for it to disappear.
All in One Webmaster has options to add Google, Bing, Alexa, Blog Catalog, Yahoo’s Webmaster and Analytics code (meta tags).
Facebook Members is a WordPress Social Plugin that enables Facebook Page owners to attract and gain Likes from their own website.
FourSquare Integration allows you to view your last checkins as a list or on a Google map on Pages/Posts.
TagSpace lets visitors browse your WordPress categories and tags by flying through them in 3D.
Twitter Goodies shows your twitter profile/search tweets under your Sidebar Area (Widget), Post and/or Pages.
WP Archive-Sitemap Generator generates simple Archives/Sitemaps based on your blog’s posts and pages.
WP Google-Buzz automatically displays a Google Buzz button for every post and page.