On Sat, 14 Apr 2007 22:13:48 GMT, Ed Sullivan wrote:

Since you brought it up, the dictionary does not contain Misspelt as a
variant of misspelled.
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http://www.urbandictionary.com/define.php?term=misspelt


5. misspelt

V. To spell a word incorrectly.

According to the Oxford American Heritage Dictionary, Herald colleges
edition, both "misspelled" and "misspelt" are acceptible.