How do you detect batter life/% left on the iPhone 3g?

Hi Cocoa/iPhone Developers-
I was wondering if there was a clever way to figure out the battery life left on the iPhone?
I attended this years' WWWDC and I believe the apple-experts said that they are potentially working on this ability for a future iphone build, but I was wondering if there is anything else I can do?
thanks

Ahhhh...I missed the salutation. The "clever way" would be to post this question in the developer forums, instead of here in these user-to-user forums.

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