The Eggcorn Database

The word eggcorn was coined collectively by the linguists who write at the excellent group blog Language Log. Linguists collect usage examples. Unlike language teachers or the often self-styled grammar experts who complain in the press about the decay of English, they are not picky: the actual, real-life use is what counts, and the most interesting bits — those that might reveal something about how real people apprehend their language — often stretch the received rules of correctness.

In September 2003, Mark Liberman reported an incorrect yet particularly suggestive creation: someone had written “egg corn” instead of “acorn”. It turned out that there was no established label for this type of non-standard reshaping. Erroneous as it may be, the substitution involved more than just ignorance: an acorn is more or less shaped like an egg; and it is a seed, just like grains of corn. So if you don’t know how acorn is spelled, egg corn actually makes sense.

http://eggcorns.lascribe.net/