Garmin Nuvifone

an iphone alternative. because there are other options, this being only one of them. Samsung i900 is another and so is the awesome HTC Touch Diamond also not forgetting Sony's XPERIA X1
There is also the HTC Touch PRO which is much like the Touch Diamond but has a slide out keyboard and a microSD memory slot.

www.garmin.com/uk

Also, unlike the Iphone, who fails in this area, this device will give you turn by turn directions with voice prompts.

For a good idea of two possible devices which could be a better alternative to iphone goto gsmarena.com where you will find a comparison between Samsung i900 and the HTC Touch Diamond