1. A computer-implemented method of assessing speech pronunciation, comprising: receiving speech for analysis via a computer-readable storage medium; performing automatic speech recognition on speech using a processor to generate word hypotheses for the speech, the word hypotheses identifying a set words recognized by an automated speech recognizer in the speech using one or more data processors; performing time alignment between the speech and the word hypotheses using the automatic speech recognizer to associate the word hypotheses with corresponding sounds of the speech; calculating statistics regarding individual words and phonemes of the word hypotheses using the processor based on said alignment; calculating a plurality of features for use in assessing pronunciation of the speech based on the statistics using the processor; and calculating an assessment score based on one or more of the calculated features.