Route Planning Software

I'm not quite a mac user, my first mac, a 12" iBook G4, will be arriving next week.

I'm hoping to buy a car in the next few months and was wondering if there's any decent route planning software out the for the mac? I'd like to plug a GPS in and have my iBook sat next to me telling me where to go.

Route 66 for the UK has been recommended to me, but I'd like an application which can talk to me, so I don't have to keep looking away from the road.

Anyone know of anything that might suit me?


Thanks.

Wolverine