A great website which almost all Japanese XM, Xm owners are relying on.
Do pay a visit and you will be surprised.

http://www.geocities.jp/tosgarde/

Almost all articles are in Japanese unfortunately.
But more and more visitors will encourage the blog writer for more and more article in English version.

The one below is an example in English, which I did work with.

http://www.geocities.jp/tosgarde/en/xenon.htm

Also I am running my own blog. As I wrote off my 93y. XM Break 3000cc V6, I have only Peugeot 504 which is a main part of my blog now--. But hoping you enjoy!

http://blogs.yahoo.co.jp/vivacitroen2002/folder/520034.html