Most TVs have mounting holes on the back so you can mount them on a wall, but Lifehacker reader Rehevkor uses them for something else: mounting his Wii out of sight.
With a few universal hooks, you can put just about anything back there:
I mounted my (admittedly currently underused) Wii to the back of the monitor using the screw hole mounting and mounting hooks. I just got the right bolts (M4) found some hooks that snuggly held the Wii and bolted them to the monitor. The Wii just sits in place. The hard drive stops it moving out of place.
In theory, you could do this with just about anything, as long as it isn't too heavy. You could mount your Wii, a small cable box, your DIY media centre, or just about anything else as long as your remote doesn't need to "see" it.