For those in our community who have an interest in mobile (iPad, iPhone, and Android) music production, Music App Blog has posted a great list of resources.

http://www.musicappblog.com/ios-music-making-links/

IOS Musician has a solid list of available apps.
http://www.iosmusician.com/app-lists

and Dischord has a good buying guide.
http://discchord.com/ipadguide/

Hope this helpful.
Cheers

Steve