Postal Codes in Japan

If you’re in need of finding a Postal Code (aka Zip Code) to a location in Japan, there are a few good resources.  To learn about the Japanese Postal Code system and address usuage, having a look at this Wiki here would be helpful.  And to check out a zip code you could look here, but I also like a website called "diddlefinger".  I did not just make that one up!  It’s a decent site, really!