Free App From AOPA: Fly Q
 

Fly Q is a free app from AOPA. Works great on the Ipad. Has detailed information for airports. Also flight plans and DUAT weather briefings.

A quick video about Fly Q

Article about Fly Q

Edits:
Just now learning the app. It requires your AOPA login to activate. Your password for DUAT, certificate number and N number for flight planning. A droid version is supposed to be just around the corner.