iPhone: Google's updated Google Maps for iOS with spoken traffic alerts, which means you'll get notified of all the upcoming delays on your route while you're driving.
As the name suggests, the app can now send spoken alerts about accidents, upcoming traffic congestion, and other incidents. Likewise, you'll also get a summary of all those fun events before you drive. Android's already had this for a while, but it's a handy new feature for iOS users.
Google Maps (Free) [iTunes App Store]