Hidden Media is basically a PC "disguised" as furniture, obviously a good thing for media PCs (although there are some great looking hi fi style cases out there). I found the most ironic bit at the end of the article when the 'case' is photographed in situ, and you see how utterly crappy the rest of his furniture is. Wow, am I a furniture snob?
Personally, I prefer my approach - I disguise my computers by putting them in a rack and filling it with neon. It's so close to looking like a fridge (hey hang on, is that an idea for a 'rack mod'.. is there a rack modding community out there waiting to receive me with open arms?) that it could never be mistaken for computers.