Kenwood i-K50, due out this month in Japan, no word on US release date. I'm holding my breath, hoping the integration is good. Picked up an iPhone in December, and am getting tired of carting around my iPod as well, since the dock connector on the Pioneer neither charges, nor plays the iPhone. Estimated at $260 USD.

Second, iPhone app, "Dynolicious", $12.99 to measure 0-60, 1/4 mile, hp, lateral G.. 4 stars so far.. tempted...

there are some freebies that do the same
just do appstore search for dyno

Huh. hadn't noticed the free one. I'll give that a go.