1. A machine readable non-transitory storage medium storing executable instructions which, when executed by a data processing system, cause the data processing system to perform a method comprising: storing a phonetic dictionary for speech recognition; obtaining words from a user's set of one or more databases; receiving a speech input from the user; responsive to the speech input, processing, using a plurality of pronunciation guessers, the words from the user's set of one or more databases, the processing producing additional phonetic data derived from the words, the additional phonetic data forming an extended phonetic dictionary unique to the user; processing the speech input by comparing phonemes detected in the speech input to the phonetic dictionary and to the extended phonetic dictionary to determine a set of one or more matches; and determining a best match from the set of one or more matches.