Iphone just got better !!!!
A free application for browsing all of Jim Breen's Edict dictionaries is now available in the appstore, under the name wwwJDic (you might want to look under Education if you're using the mobile AppStore from your phone; I couldn't locate it using the search engine...)
It's very nice, supports EN-JAP and JAP-EN search, as well as Kanji look-up. You can also use the writing pad input (in chinese keyboard) to look up japanese kanjis and words !