"I" am working on getting Japanese things (anthy, nunome) working with OZ at
http://gakusei.sf.net. I have been doing so for a long time, though, and as a non-programmer have not made much progress myself so far. So, do not expect anything too rapidly. Any input from programmers and non-programmers alike is welcome. Gakusei should be a community for people using their computer/PDA as a learning aid for the Japanese language.
That much being said, anthy does compile on OE thanks to some great work by Philipp Zabel. Thus, it is available for OpenZaurus. Anthy is only the backend, the front end still needs some work. I have contacted the Japanese developpers of anthy and got a reply with some help. Unfortunately, I have not yet had the time to work through these suggestions.