Nobu has just released a new inwall touchscreen computer that's bound to get the home automation crowd to sit up and take notice. It's fanless, so it won't annoy you when you use it for application like home theatre or office, and with a 1.0 GHz Intel Celeron onboard, it's not a toy.
Not cheap at a reported $3625. But the solid state disk drive and fanless processor make it an attractive choice for powerful, quiet wall candy. Your remote controls are all lost in the cushions anyway.