Looks very handy for anyone translating those lists of references at the end of technical-journal articles.

From the Japanese post office.

hat-tip: Warren Smith

Includes tolerable English glosses and Japanese explanations of terms

Can be used to find English renderings of the names of Japanese authors of academic papers, as well as technical terminology.

Mostly English-language style guides, dictionaries, and references about Japan

A style guide giving advice on handling Japanese-language materials in English texts.

Looks up Japanese postal codes. Also gives phonetic reading for place names.

A big collection of reference links, all compressed onto a single web page. Links for search engines, glossaries, news, etc. Somewhat disorganized, but extensive. Thanks to Adam Rice for this entry!

A searchable database of geographic names. Arranged in a hierarchy, so you can drill up from your search result to find county, region, state, and so on for your original village name. The alternate spellings in the database make this a good site to go to when you have a mysterious katakana rendering of a place name.