If you're interested in LEDs, CFLs, etc. then you'll probably find this short video on ZDNet interesting.A 250 watt plasma light bulb from Luxim that puts out 140 lumens per watt...but after skimming the data sheets, I'm not clear on whether we'll ever see it in a relatively small package (1-10 watts) for portable lighting (e.g., flashlights).
And, the efficiency is not that far above where the best LEDs are today...though I'd guess that there's been a lot more R&D thrown at LEDs to this point.
Finally, I'm not seeing any cost figures...maybe too soon to tell how cost competitive it will be. This article (whose LED efficiency numbers are dated) seems to think they'll be a bit pricey for a while.
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