I have just read the 2 volumes of "Black Jack Alive", an anthology by today's famous manga artists. Each episode features Black Jack of course, sometimes other Tezuka characters as well, or famous characters of the author. There are short essays by each author in the last pages of the book.Published in January 2006, by Akita Shoten.
Following is the list of the authors;
Vol. 1
Taguchi Masayuki
Hazuki Kyo
Murao Mio
Kondo Yoshifumi
Takakura Atsuko
Iogi Juichi
Serizawa Naoki
Tezuka Makoto
Kikuchi Shouta
Sato Makoto
Kitami Ken'ichi
Vol.2
Aoike Yasuko
Tachihara Ayumi
Shibata Masahiro
Okazaki Takashi
Yoshitomi Akihito
Takaguchi Satosumi
Tagami Yoshihisa
Yamada Naito
Inui Yoshihiko
Yagami Ken
Nagai Gou
I might be safe to say this anthology is just like a doujinshi made by famous artists. The list is really gorgeous.
And it was fun reading them. Especially the episodes by my favourite artists such as Aoike Yasuko, Shibata Masahiro were a great treat for me. Some artists were new to me, though the episode by Yamada Naito in vol.2 made me cry; it was quite moving.