Quite the range of subjects and genres...except most of them are published by Viz Media. Hmm.

Anyway, in alphabetical order:

1) 20th Century Boys by Naoki Urasawa
Had to wait for Viz to finish Monster for this one, and the wait was worth it.
2) A Drifting Life by Yoshihiro Tatsumi
Everything you ever wanted to know about manga creation in the postwar period...and then some.
3) Butterflies, Flowers by Yuki Yoshihara
The horrors of life as a working woman, played for laughs. Nostalgia for Kimi wa Pet.
4) Children of the Sea by Daisuke Igarashi
It's pretty, and the paper quality is excellent. Yeah, that's plenty.
5) Detroit Metal City by Kiminori Wakasugi
So campy. I nearly died from laughter.
6) Gravitation Collection by Maki Murakami (two-in-one reissue)
Boyband bishounen, just as good the second time around.
7) Kimi ni Todoke by Karuho Shiina
Pitch-perfect school-days shoujo romance.
8) Moyasimon by Masayuki Ishikawa
If only because the subject matter is so darn unlikely.
9) Ôoku by Fumi Yoshinaga
Gender-bending costume drama, ahoy!
10) Sayonara, Zetsubou-sensei by Koji Kumeta
A satirical education in Japanese literary and popular culture.