http://ameblo.jp/cmjk
There's also a list of all of Ayu's staff who have blogs at this blog:
http://ameblo.jp/ayu-amazon/theme-10010433532.html
Mm, dedicated Japanese Ayu fans.
I must say that CMJK rarely mentions stuff about Ayu, though he did talk a lot about his work in London with Yuta Nakano (called Nobita, I think, like how Ayu calls him) and mentioned a few acoustic guitar recordings for the album in London.