The Sky is the Limit
If we can envision an application that can be controlled via the telephone, there is a good chance we can create it with Asterisk. Some examples of projects that are possible with Asterisk include:
RSS readers using text-to-speech engines
Movie listing and screen times
Employee time clock
Controlling a television DVR
Home automation using X10 controllers
Interactive games
Bluetooth presence detection
Monitoring of health sensors with automatic emergency dialling
Babysitter monitoring
Home/Business burglar detection and alarms
Calendar system with phone call reminders