Automatic Plugin Update Checker simply notifies users when plugin updates are available without the plugin needing to be stored in the WP plugin repository.
AZ-One locates the Amazon store (com, ca, co.uk, de, fr, jp) closest to your visitor and changes the associate links on your site to direct the visitor to the right store.
Banner Admin allows you to manage various banner ads from different affiliate programs.
TextMe sends a carbon-copy of all admin emails sent via SMS to your cell phone.
Video Embedder makes it easy to embed videos from various sources, such as YouTube and Google Video.