Have you checked out the latest incarnations of the above mentioned apps they are simply stunning if you have the iPhone 4/4s with the hi def screens.
These two apps I find excellent for showing the grand kids and people who aren't necessarily into Astronomy and they have just been updated for the new iPad as it will have the fancy new screen as well.
The detail in the graphics is outstanding and they have also smartened up the functionality as well as boot up time and operational speed.
Have a look you'll be amazed.
It's by no means a powerful app when comparing to Sky Voyager or others of its ilk, but StarWalk is nonetheless "pretty" and basic enough for public viewing night duty. I like it too.
if you have the iPhone 4/4s with the hi def screens.
