I could have sworn that it’s illegal to have stuff hanging from your rearview mirror in some states. Fuzzy dice, Hawaiian leis, air fresheners – all hilarious and/or kitschy, for sure. But your iPhone? Seems a bit much, although it’d be nicely positioned to use GPS features.
You’d have to be delicate when removing the phone from the mount, too, as you’d run the risk of realigning the mirror. It’s being sold for $20 by a company located in Hong Kong, so make sure to check with your state’s driving laws if you’re looking at ordering this thing.
Custom-Made Rear Mirror Mount for iPhone [USBfever.com]

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