This July, Philips will release an LED bulb that's ready for mainstream consumption, the Master LED.
Fitting in a standard bulb socket, the mercury-free Master LED bulb sips just 7W while burning up to 45,000 hours, or about 30x the length of a normal bulb. It's actually already available in parts of Europe (
we can't spot a price, anyone out there know? UPDATE: About $US50), but with the proper retail availability, I could see an LED light with this form factor exciting the mainstream US public, couldn't you?