For some reason, matchbox-keyboard wouldn't write in this reply box so I've been through a series of installs & uninstalls.

I'm pretty sure maemocjk works fine & gjiten should too (I installed for an quick test without dictionaries). I guess it is personal preference, 2007 or 2008.Although I guess 2007 is easier for Japanese support.

BTW: I don't know Japanese, so excuse the typings. Personally, I find the cjk interferes with os a bit so I am just going to set up a separate partition and install the CJK,gjiten & some sdict Japanese dictionaries there.