In the iPhone 1.1.1 update (which I grudgingly upgraded to in spite of losing iToner and my assorted third party apps, mostly because 1.1.1 finally allowed me to read PDFs sideways, making the iPhone a passable PDF reader if I use the Yahoo! Mail hack...but I digress...), Apple added an undocumented (as far as I can tell) feature for those of us using the Apple Bluetooth Headset that I think is incredibly cool. If the headset is paired with the iPhone and active, the iPhone will display the battery power remaining in the headset, updated over the Bluetooth connection:
This means that at a glance, you can always tell how much charge the headset has left.
Oddly, I haven't seen mention of this feature anywhere (and can't even find it on Apple's site). But I think it's absolutely fantastic - I couldn't count the number of times I went to use my headset with old phones only to find it had run out of power (but had no indicator anywhere to let me know how much charge was left). It's baffling to me why Apple isn't obviously advertising this as a major feature of the Apple Headset - it's the kind of thing that actually could be a compelling reason to buy their headset over a third party one for many people.
(The aforementioned email to Mr. Gruber was actually in reference to his Linked List posting about the ringer silence switch. It is similarly baffling to me why the iPhone doesn't simply show an icon in the status bar when the ringer is switched off. That seems like an obvious thing to do, and would lead to a lot less confusion.)
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