Lumelab have released a 42" LCD with a built in PC. Powered by a Core 2 Quad Q9300 with a 1Tb hard drive, it comes wrapped a beautiful handmade aluminum case. A bit on the pricey side a nearly $4000 dollars though.
Control a PC using gestures on this multi touch 42" screen from Lumin Technologies. Expect to see manufactures releasing consumer models in the near future.