I searched through BlackBerry App Word for quite a while for a package tracking app and finally found one. The application is simple to use but packs quite a few features. You can track packages from both FedEx and UPS. One of the cool features of this application is the ability to track and map the route using google maps. The app also allows you to save multiple tracking numbers and retrieve it any time you want to look at the progress. Another feature is the details window that gives you a detail list of information of the package you are tracking.
To download go to this Link
Also I wanted to say I wrote this post entirely from a PlayBook, it was a lot easier than expected. The BlackBerry PlayBook handled WordPress quite well.