The Simon Fraser University Speech Error Database (SFUSED) is a multi-purpose database designed to support both language production and linguistic research. This talk reviews some recent research results from English and Cantonese (http://www.sfu.ca/people/alderete/sfused) as a way of explaining the logic of the database and how it can be used in new projects. It also identifies some of the current limitations of the SFUSED and sketches how planned developments of lexical, morpho-syntactic, and phonological structure can address them.