Not just for your iPhone, the Kensington Dash Mount fits pretty much every iPod model ever made and keeps your gadget within handy reach. Just secure it on your dash and the adjustable side clamps will happily hold your iPhone or iPod even if they're in cases. So far, it's the first accessory I've found that does this and since I'm always on the run (translate: late), being able to just snap it out of the mount and dash is a big plus. It also features a rotating head which allows angle adjustments and horizontal or vertical movement. Handy.

$29.99 at Kensington.