I don't understand how this works, but the EEF Residential Power Saver unit claims to reduce energy use bills by 20-25% with a $300-400 investment. From their website:
The basic principle behind these units is as follows:
Inductive loads such as electric motors, pumps and compressors kick back unusable energy into the power system
This unusable energy materializes as heat build-up in appliances, noise on transistor radios and cordless phones, etc
The power save units contain energy saving capacitors that absorb this unusable energy and recycle it as usable electricity that can be used by electrical appliances, thereby reducing the energy demand from the power company
This process can reduce your usage and therefore your electrical bill by as much as 25%*.
I also ran across this website: http://www.growandmake.com/grow-and-make-tv where you can watch "weekly green living episodes."