Nihongobot
I have just found out the Nihongobot Jabber robot. Nihongobot acts as a normal contact you can chat with. The only difference is that you can ask him to look up words for you in EDICT. This means that you can turn your Jabber client into a Japanese dictionary. Very clever idea !
Now what about a bridge Jabber <-> DICT ? It would allow to look up words on DICT servers such as dict.org or nihongobenkyo.org from gaim :-)