Browse the net, and work outwards from there. They can do whatever suits you best in a paradigm that involves accessing information via touch screen interface.
Here are some apps I found interesting, some a free some not:
Games:
Bubble Explode
Reckless Racing 2
Diamond Dash
Cro Mag Rally
Galaxy on Fire HD
Jet Ball
World of Goo
iSlash
Contre Jour
Astra Jigsaw Puzzle
Airwings
Tiny Wings
FC Rocket
Amazing Alex
Super 7 HD
Osmos
Art:
Bamboo Paper
iDraw
Paper (53)
Art Rage
Sketchbook Pro/Lite
Adobe Ideas
Brushes
Penultimate
Inspire Pro
Procreate
Auryn Ink
Sketch Club
My Brushes
Ink Pad