LED backlit LCD screens are fantastic. Hopefully, people buying LCDs will use them for years to come because we really don't need more e-junk. It's a bit bothersome to think about all those plasma tv's with their short lifespan ending up in the landfill.
I'm still waiting to see super-efficient long-lasting LED lighting come to more homes. It's slowly catching on, but the advantage of LED lighting around your home is that you can use many low-light bulbs to create a glow in a room, instead of having a single overly strong light source. Moreover, I want to see the light-emitting paint/wall surface materials they were dreaming up come to fruition.