ProgrammingOnHandHelds require lots of thoughts on energy (power) conservation considerations.
An example is WiFi. NextBigThing WiMax PowerUsage needs will still be too much for SmartPhone. See the WiMax page for article reference regarding this comment.
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ThirdGeneration power needs appear to be better, as said in the above article
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TransMeta seems to focus on low-power CPUs for laptops
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Power is a major issue for many EmbeddedSystems.