TwitterMinder allows you to automatically post Twitter messages from your Google Calendar. TwitterMinder will check your Google Calendar for events that are occuring in the next hour, and if it finds any they will be automatically submitted to your Twitter status.
Simple Tracker is a simple service that will accept a tracking number or package id from major shipping companies (FedEx, USPS, and UPS), and spit out an RSS feed which you can then subscribe to in your favorite feed reader (FeedDemon, Google Reader, Outlook, Bloglines, etc).
RSS-to-iCal is a simple service that will accept an RSS feed, search it for calendar events, and spit out an iCalendar feed which you can then import into your calendar application (iCal, Outlook, Google Calendar, etc).
AWSLink converts Amazon page urls into Amazon Associates product links.
AmzWish is a widget to display your Amazon wishlist on your blog or webpage. Users can click on an item from your wishlist and purchase it for you.