I think it's going to be at least 5 to 10 years before LED goes anywhere close to mainstream. People have been taking about "1 to 2 years" for the past 5 years. At that time I told them it would be 10-15 years.

The prices are just far too high at the moment and most people will never amortize the price of the bulb with savings in electricity. They might work for some high-demand installations, but not for the typical household. Some of the current LED stuff also generate too much heat and require ungodly sized heat syncs.

I have LED under the kitchen cabinets, CFL in all ceiling fixtures except the dining room and master bedroom (on dimmers) and two halogens in my range hood. I've tried some dimmable CFLs in the dining room with a brand new CFL-safe dimmer and the produced way too much audible buzz, so they're out until I can find something better.