Control your device remotely via SMS by sending shell commands.
An endless amount of possibilities that you can do with this app.
Some few examples of a lot more......
-Listing of folder contents
-Finding out how much diskspace is used
-Showing environment variables
-Listing installed packages
pm list packages
...but best of all...you can even start and control other programs(activities) with the activity command line manager(am)
Play a video with YouTube
am start -n com.google.android.youtube/.PlayerActivity -d http://www.youtube.com/watch?v=MTT-crZBB0k
Play a song from sdcard with media player
am start -a android.intent.action.VIEW -d file:///sdcard/YOURMP3SONG -t audio/mp3
A lot to explore on your device!!!
More information on intents: