Tell us about yourself!
This seems very long winded and expensive as those home plugs aren't cheap.I've just automated a lot of things but using a WIFI shield for the arduino. It also acts as a web server and puts out a nice graphical front end to turn things on/off. Additionally instead of using all those components you have I simply bought an 8 ch relay controller for around £5. Now I can turn many things on/off from the web and it works great on any mobile phone too. I've also purchased a £4 RF remote kit which can also turn the volume up/down on things but again you can send signals to this over WIFI as it will be going through the Arduino 1st :)