I think the definition of "power user" still needs some work.
I could easily spend almost all of my spare time on my iPhone, mostly internet browsing and reading/posting on forums. But I don't, because I have Macs available at home and work and I want my phone to have a charge when calling or texting.
To me, a power user is one that knows the in's and out's of a device. Shortcuts, tools, workarounds, ways to make the device work for the user. Perhaps that's because I'm in front of a Mac all day and I'm paid to work quickly in a variety of graphic design applications. A power user will know all the little tricks to make short work of things.
But that's subjective too. Because I'm a power user compared to the average iPhone user. I don't need to ask questions about how to attach photos to text messages or save a photo to my camera roll and so forth. But compared to some of the devs in the jailbreak section I'm a complete moron and know nothing. SHSH blobs, basebands, stitching IPSW's…UGH!
But…if we're going to stay with the definition of power user as someone who uses their device all day and has to recharge it periodically…I'm a power user.
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^^^^This. Jessica got to it before me!