You can tell I'm on holiday, lol.

Check this out:

http://www.googlefight.com/

Could, probably, be used for language learning to find out which word is more common.

It doesn't seem to like my Japanese text though, :p

This site does a similar thing, but is intended for helping people with proof reading, though I've used it to help when I am thinking/writing in French and want to double check my phrases. It accepts Japanese text I think (did a little copy and paste test, but I still can't read Japanese so I don't know.)

http://phras.in/