Heh, I do the exact same thing. Especially with Ikea furniture - I would tape the wrenches, manuals, etc somewhere not easily noticeable.

Another thing I do is behind my TV, or in the back of my computer, I create little paper tags that I tape onto the power cables. So, in case I need to unplug something from the wall, I don't need to trace the connection to know if I'm going to unplug the TV and lose all my presets, or just the floor lamp.