Here is a nice how-to on controlling your Raspberry Pi via Voice Control. The tutorial includes all needed scripts, and you can add any commands you would like your Pi to execute.
The only thing you'll have to change are the servers the script is trying to connect to because I am from Germany.
http://raspberrypi-hacks.com/11/control ... e-control/
With these scripts you can let the Pi tell you what weather it is, turn light on/off and a lot more stuff. I would appreciate any ideas to add to the script