What map / navigation / bike direction apps are available for the iphone for commuting / urban cycling I'm switching from an android phone to an iphone soon. I use the google maps bike directions all the time to figure out how to get to friend's houses, restaurants, bars and navigating around a new city, usually with no pre-planning on a computer.

On my droid, I just bring up google maps, type in an address, and get bike directions.  However, the iphone doesn't have bike directions on the maps app.  What is a good native app alternative for the iphone?  

I'm not trying to track my rides. Just trying to figure out how to get from A to B.

Update:
It does seem that the cycling layer and bike directions are serviceable in a pinch on the google maps website when viewed on the iPhone or android device, but a native app would be more desirable.

Edit: June 2014 : Google Maps on the iPhone does support bicycle routes.
Have you tried "Get there by bike"?
http://itunes.apple.com/us/app/get-there-by-bike-interactive/id457288250?mt=8

The few times i tried it i had good results. 

Another alternative, but i have not used yet. http://www.bikemapsapp.com/