Let's follow and guide the public discussion of LED downlighting at Amazon Discussions as "LED retrofit for recessed lighting."
I hope we can overcome the wasteful obsession with residential lighting as of point-source bulb form. In a point-source expression of LED light, more than half of input energy is simply wasted. The cheapest trick is in very thick obscuring plastic that glows, looking like the incandescent improvement of candles and gas or oil lamps that are history. Let's hope all point source bulbs will be history.
In commercial applications we have not tolerated antique bulbs, for several decades. Why should residential lighting be different?