Ozrunways
If you are in Australia the Ozrunways App is awesome. DAPs, ERSA, AIP and all maps and charts for the whole of Oz giving aircraft location for situational awareness (can't be used as a means of Nav though).
Also if you have an iphone you get a free subscription for that as well - so you have it all on your ipad and iphone for the same price for redundancy.
I'm told the developer is also working on a flight planning update and since he has written the NAIPS app as well, I'm assuming realtime weather will be included as well.
Bloody good job by the developers......