On the web, you can find plenty of sites from where you can download applications for your BlackBerry phone. However, after installing some applications on your phone that some of the applications are simply useless. Hence, not all the applications present on the applications download site are good.
Here are some BlackBerry applications that you should avoid:
Berry Screen Cleaner
It is an accelerometer based applications for you phone. Just launch the application and you will find water droplets appearing on the screen of the phone. These water droplets are supposed to clean the screen of your phone. In order to this, you are supposed to tilt the phone until the droplets spread and disappear. Since cleaning the screen of your phone is a physical process and not a virtual one, this application is simply useless.