1) Is it warm? If it generates heat it draws power, so you should consider anything that is warm as a potential energy eater.
2) Auto-shutdown your computer. This works for MOST people. You can create a scheduled task that performs a shutdown of the computer at a specific time. Task scheduler has an option to not execute if the computer is in use as well, in case you're up late. Yes, there some people who this would be incompatible with, but for most it works fine. Most computers have a "wake up" function in the bios, so the computer can automagically come on later if needed. Of course, if it can wake itself up then it too is drawing some small amount of power from somewhere to pull that off, possibly the RTC battery. The command for task scheduler to use is "shutdown.exe /s". *nix systems have essentially the same command, but if I have to explain cron to you then you don't need to be messing with it :).
3) My understanding is that Satellite dish boxes are big power eaters, as are many HDTV set-top boxes, and game consoles. I don't do this, but perhaps a lamp timer to remove power an hour or two after normal bed time and cut back on around the time you'd normally watch TV?
4) Water heaters are notorious energy eaters. I have mine on a timer, it comes on about an hour before wake-up, cuts off about an hour after I leave the house for work, and cuts back on near the end of the day for a few hours to allow for laundry, end of day showers, etc. The good part is the water stays hot for a while, so you can still get some hot water even after the timer has cut off. Most have an over-ride button in case you need it on at odd times.