Thanks for the reference. I have also recently released my own JavaScript hyphenation engine:

https://github.com/bramstein/Hypher

It is quite small and fast, and mostly aimed at integration with other libraries, unlike Hyphenator.js (which comes with a partial DOM library.) An example integration can be seen in the Treesaver library (https://github.com/bramstein/treesaver/tree/hyphenation) where it is used to hyphenate magazine columns.