Foursquare Latest Checkins allows you to show your recent Foursquare checkins and the venue icon as a Widget in your blog’s sidebar.
WP Static HTML Output produces a static HTML version of your WordPress install, incredibly useful for anyone who would like the publishing power of WordPress but whose webhost doesn’t allow dynamic PHP driven sites – such as MobileMe.
AddToAny: Share/Bookmark/Email Button helps people share, bookmark, and email your posts and pages using any service, such as Facebook, Twitter, Google Buzz, Digg, Delicious, and well over 100 more social bookmarking and sharing sites.
Cart66 Lite is a simple to use yet powerful eCommerce plugin for WordPress.
Theme-Check allows you to run checks on the current theme before uploading to WordPress. This plugin uses the same API and is kept more or less in sync with the WordPress.org uploader tool.