I think the best iPhone Astronomical App is
GO SKYWATCH.
.. making the best use of the accelero-compass gear, you can point it to the nightsky and it tells you the names!
I make the
THE ASTRONOMICAL POCKET DIARY (
info)
and now have a iPhone/iPad/IPod Touch version for 2010+2011!! Very Nice on the
iPad, too!
For 2011, a
paper/print edition customised for Brisbane is in the works, and maybe one for Sydney if there is a demand at all.
cheeerio from hot Germany,
Norbert