Midori Traveler's Notebook, or Traveler's Notebook is described as "a simple notebook focusing on ease of writing, with a leather cover in the which the texture gets better as you use it over time." The leather covers on these notebooks, available in black and brown, are especially hand-made in Thailand, while the notebook inserts are printed in Japan, using Midori's original paper materials. Several types of notebooks (refills) are available to choose from: ruled, plain, squared. Enhancements like card files and zipper files are also available. Midori also offers repair kits and binders for the notebook refills.
I'm really drooling over this one, especially after seeing the Traveler's Notebook photoset at Flickr. Now I'm saving up to buy one. Heard that a notebook set costs a huge US$47.95! Woah. But I'll have this, or both. It'll take a while, but I'll have one.
(Photos above are from Midori's website.)