To quote the MetaFilter post where I found it, “Nihongodict is an AJAXy online Japanese-English dictionary. The list of matches auto-updates as you type. You can enter (or paste in) romaji, Kanji or kana, and use character maps for hiragana and katakana. Results can be bookmarked. It’s huge fun to play with, and a nice front end to EDICT, a freely usable dictionary … with about 120,000 entries, largely maintained by one person (Jim Breen, Monash University).” The comment thread contains many other useful resources for Japanese as well as informed discussion of the “SKIP method,” notably by Matt of No-sword. I fear I’m never going to get around to relearning the Japanese I lost after the age of four, but I present this as a public service to those who can use it.