EBDict is good if you have EPWing dictionaries in the proper format, though it's UI isn't exactly great on the N900 outside of EasyDebian.

Also:

- The SCIM method is very much a statically sized window, and would need a rework for Maemo. Placing it in the status area would probably be a good idea. I don't think that would be too terribly hard, but if you're going for that then reworking the config dialog is probably in order as well.

- In all oddities, for me it works great with the hardware keyboard. I can hit ctrl+shift to switch between English and Japanese input. The only problem is eventually the text input loses focus and I have to flip out and back into the program for it to recatch. It also kills the hold for the blue arrow (->) key, and disables the symbol menu completely when in a program that has the IM module active.

I'd love to see more hands on this project, as I'm going to Japan for 2 weeks in August and would love to have fully functional input by then