Self-Powered Redstone Lamp as can be seen in this short video: http://www.youtube.com/watch?v=H3m3cH8yul0
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Block update issue. Now to find a related ticket... Neat lamps!
Mojang should make a compact self-sustaining dust that could continuously power itself, or be able to easily hide & attach to blocks like these, and keep them powered.
Activate the piston, observe the redstone dust on the left is still powered.