Yep, our spell checker is an AOLserver module that links to the aspell library tools. It is capable of taking a forum thread and detecting most misspelled words, supports multilinguality and allows for the whole text to be corrected in one go (you get select boxes for all misspelled words when you confirm the posting).
Release, well.. Good question. We need to package it up and polish it a little bit, but if you are darn serious about using undocumented code, drop me an email, and I'll send you what we have.