Nadav Kavalerchik is a brilliant Isreali chap with a penchat for churning out Moodle custom code like the Spelling Bee. If ever there were a Nobel Prize for Moodle Open Source coding, this Moodler would be a serious contender (amongst others) for the title. He has written a brilliant piece of code that is the Spelling Bee block. Created in November 2009 and updated in July 2011.
How it works is simple. Students are presented with an English word they should hear (audio using flash) students can choose one of the three difficulty levels for words.
Screen 1: Easy Level
They are then asked to type in the word they heard and check the spelling. Pressing the "new word" button retrieves a new word from the dictionary. The block's code is based on a http://www.thefreedictionary.com/ igoogle free service. Unless your IBM's Watson, I doubt if you could score high in Nadav Kavalerchik's Spelling Bee block for Moodle.