While we're talking dictionaries, a related question: why are there no (so few, open-source, English) pronunciation guides out there? Lots of perfectly intelligent people can often be heard repeating a way-off pronunciation.

We have made spell-checkers more-or-less useful, we have huge collections of semi-trustworthy information at our fingertips, and robots to answer questions. But. I'm sure people struggling with learning languages different from their native tongue would very much appreciate typing in a word and hearing a semi-trustworthy pronunciation. Why oh why?