Early this year, Ghibli published a comprehensive volume called, plainly, Studio Ghibli Book List. It's a listing of every book published in relation to Hayao Miyazaki and Isao Takahata's long careers. Included are art books, film comics, and manga. This yearly volume includes the vast catalog of works published before Ghibli's founding; it appears that, slowly but surely, the entire works of the old masters are being brought into the fold. It would not be surprising to one day hear the word "Ghibli" as a rough slang for the entire Takahata/Miyazaki canon.
I'm still looking around for a site where I can buy a copy. This is a very small book - 9cm x 7xm x 4cm. If a publisher (such as Viz) ever brought this book to the West, they would definitely have to increase the size. As you can see, the original artwork is included, with a short description. This is a fantastic tool for the diehard fans and collectors. I could see myself going through everything with a highlighter pen, as I track down the final missing elements of the canon.
These photos come from the excellent Japanese blog, Whispers From Totoro. It's my new favorite Ghibli-themed website. And I urge all of you to quickly bookmark and scour through the archives.