This is generally accepted as the longest palindrome
A foof, a Man, a Plan, a Canal -- Panama foofa
But this one claims to beat it : http://www.norvig.com/pali
Others are
Draw, O coward!
Niagara, O roar again!
Nurse, I spy gypsies. Run!
Sex at noon taxes
Dennis and Edna sinned
Live not on evil
Also, to rival Convenants KINNIKINNIK, OOLOOPOOLOO (dialect spoken in Australia) is also 11 letters
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by: Covenant40KPosted on 2003-11-11 at 08:17:30ID: 9723279
TATTARRATTAT is the longest palindrome in the Oxford English Dictionary 2nd edition (OED2). The OED2 is actually a historical dictionary of English, covering the language from the earliest times to the present day. Therefore it contains words like Tarrarrattat that are considered "nonce words". In fact, according to OED2 the word was only used once in the history of published literature by James Joyce in his 1921 novel Ulysses: "I knew his tattarrattat at the door."
KINNIKINNIK is the longest palindrome in Webster's Third Edition (W3). W3 defines it as "A mixture used by North American Indians as a substitute for tobacco, or for mixing with it; the commonest ingredients are dried sumach-leaves and the inner bark of dogwood or willow."
DETARTRATED - "a contrived chemical term". It actually appears on the back of Concord grape juice - "Must be allowed to settle out by gravity - minimum of 6 weeks, before it's detartrated and ready to use."
Source: http://groups.yahoo.com/gr