I ran across this iPad app called Battle Map which helps you to quickly and easily create high quality maps for your pen & paper RPGs — and travel through them as your group adventures! Some features they tout:

  • Make Beautiful Maps. Draw by simply dragging your finger – Battle Map will take care of the rest and complete the edges to make your map look amazing.
  • Create Your Adventure. Choose from a library of objects to add to your maps, such as monsters to fight, treasure to find, hidden traps, and openable doors.
  • See Like a Character. Battle Map can display the map bit by bit as players explore, and reveal tiles based on line of sight and illumination.
  • Connect to a Projector. You can connect your iPad to an external projector or monitor to make your adventures even more thrilling.

Learn more about this product here.