I do not know about other people but I hate the nagging feeling if I have left something on at home (my wife if she left the curling iron on). I was looking around today at some options to turn off the power remotely or on a timer. Here are a couple that I found from ThinkEco and Belkin that will likely be on my list to get here soon.
The Modlet from ThinkEco can be controlled via a web browser or iPhone/Android app. It also has statistics on power usage. The price is a little high at $50 but the cost savings and piece of mind might be worth it.
The Belkin outlet is more reasonable at $10 and has a 30 minute, 3 hour, and 6 hour turn off times. Granted it does not have remote turn off feature through a browser or app, but it would still be good none the less.
I did find this motion activated one called SensorPlug that can also be useful in other applications as well. The device seems to have gotten some good reviews. The cost for this one is $10.