Smart Cover.

It really does work.

Appwise, well depends.

Garageband *Essential
Streamtome
Kindle *Essential
Instapapper *Essential
Aweditorium *Essential
CloudReaders *Essential (only for Comics)
The Final Hours of Portal 2*Essential
Appshopper
Remote
Planetary
Touch Mouse
Battleheart *Essential
Garage Inc. HD
Great Solitaire HD
Drawn - The Tower
Death Race *Essential
Infinity Blade
Mirror's Edge *Essential
Osmos *Essential
Plants vs. Zombies *Essential
Cleopatras Pyramid HD
Sword & Sworcery EP *Essential
Secret of Mana
Spirits
Star Battalion HD
Tiny Wings *Essential
World of Goo
Zen Puzzle Garden
Soundprism

Well that went longer than expected.