I just uploaded a new version, version 0.5.2, which includes a few bug fixes.
The previous version arranges for BBScanner to appear in the system menus (like Pandora does) while the app is running. The version before that includes many start-up and shutdown speed improvements.
You can download BBScanner over-the-air from
BBScanner: Listen to police and fire scanners on your BlackBerry (there's also a link to a zip file which you can use to install it via Desktop Manager).