The winner for iPad app of the year is Nik Software's - Snapseed

our friends at NIK has its "Snapseed" imaging program  judged as best iPad app for 2011. This is a huge honour for any company and shows that NIK software is held in such high regard. 

Why don't you give it a go, even available for your iPhone. Even better.... why not try the full versions for Photoshop & Lightroom.