Check out this cool idea for a hanging panel TV: when it is turned off it is a functional mirror. MirrorMedia, the company behind this idea, have a number of different sizes (smaller ones are LCD and the larger ones Hitachi plasma panels), as well as a range of frame options so they will blend in with any decor.

MirrorMedia is a UK company, and all the current retailers listed on their site are UK based. There are distributors listed for Ireland and South Africa too, but no US distributor is given 🙁