Want to try converting a Japanese website to English? Create a new bookmark in Safari's bookmarks bar (it doesn't matter for what site), then choose Bookmarks -> Show All Bookmarks and edit the newly-created bookmark. Give it a useful name, and for the URL, enter this string:
javascript:void(location.href='http://translate.google.com/translate?u='+location.href)
Now when you're viewing a Japanese site, just click the toolbar bookmark and you'll see Google's translation of the page.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050620061435108