Miss Spell's Class 2.0

the author of this app says:

Miss Spells Class is an original word game that lets players test their spelling skills against the most commonly misspelled words on Dictionary.com. Players must quickly decide whether each of 20 words is spelled correctly or incorrectly, as speed and accuracy count to get to the top of the class!

"Delightful...easy to recommend and difficult to ace." - Macworld.com iPhone Central Blog

Features:
* American English
* 10,000 words in the game
* See the correct spelling for each misspelled word
* Get the definition for every word
* Choose a font for your game board
* Game Center support
* Global scoreboard

Make the grade:
* Think quickly! A 10 second penalty is added to your time for each incorrect answer

What's New in version 2.0

Our first update in over a year; lots of new features!
Improved game play: Better indication of correct / incorrect answers, definitions added for each word
Custom fonts: Customize your game board by choosing from 3 different fonts
Global scoreboard: See how your score compares with players from around the world
Game Center support: For iOS 4.1 and higher
Share: Invite your Facebook and Twitter friends to play
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Requirements

Requires iOS 3.0 or later