My favorite ones are:
Mobile phone. I use it everyday, not only for bussines purposes but also for personal reasons. It helps me to be in touch with my parents and friends werever I go. Also works as agenda, camera, music listening, GPS...
Microwave oven. Makes my breakfast and dinner easier and quicker. Also fast lunch at home is possible if I cooked something the day before.
Remote control. I have lot of them at home. SOmetimes take the wrong one when trying to switch on TV and I am using the aircon remote control!
Satellite dish. It helps me to watch CNN news from my sofa.