In the past I've used cartes du ciel and skymap, but have settled on starry night pro.
It has excellent graphics and is detailed enough to be very useful. The telescope interface is also great. Its very intuitive and is easy to navigate through.
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor