Here are the manga sales ranking for the first half of the fiscal 2011. (Dec 6th 2010 - May 30th 2011)

Volume by volume (copies)
*1, 3,133,092 One Piece vol.61
*2, 2,698,663 One Piece vol.62
*3, 1,178,643 Naruto vol.54
*4, 1,120,177 Kimi ni Todoke vol.13
*5, 1,113,444 Fullmetal Alchemist vol.27
*6, *,997,927 Naruto vol.55
*7, *,981,451 Nodame Cantabile vol.25
*8, *,942,762 Saint Young Men vol.6
*9, *,822,941 Bleach vol.48
10, *,791,207 Shingeki no Kyojin vol.3
11, *,646,700 Bleach vol.49
12, *,629,164 Shingeki no Kyojin vol.4
13, *,605,915 Shingeki no Kyojin vol.1
14, *,604,485 One Piece vol.60
15, *,593,878 Yotsuba&! vol.10
16, *,587,565 Shingeki no Kyojin vol.2
17, *,586,726 Bakuman vol.11
18, *,559,916 Kuroshitsuji vol.11
19, *,557,236 REAL vol.10
20, *,553,245 3 Gatsu no Lion vol.5
21, *,526,693 Detective Conan vol.71
22, *,526,455 D.Gray-man vol.21
23, *,523,572 Fairy Tail vol.25
24, *,523,046 Bakuman vol.12
25, *,498,420 Gintama vol.37

26, *,467,044 Gintama vol.38
27, *,464,780 Fairy Tail vol.24
28, *,464,048 Gintama vol.39
29, *,462,581 Katekyo Hitman Reborn! vol.32
30, *,447,807 Ookiku Furikabutte vol.16
31, *,425,186 Thermae Romae vol.3
32, *,424,355 Katekyo Hitman Reborn! vol.33
33, *,408,911 One Piece vol.59
34, *,391,314 Ouran High School Host Club vol.18
35, *,388,844 Fairy Tail vol.26
36, *,381,424 Katekyo Hitman Reborn! vol.34
37, *,380,967 One Piece vol.1
38, *,372,194 Moyashimon vol.10
39, *,370,566 xxxHOLiC vol.19
40, *,361,740 One Piece vol.2
41, *,358,302 Kyou, Koi wo Hajimemasu vol.11
42, *,357,679 Soul Eater vol.18
43, *,356,021 Strobe Edge vol.10
44, *,354,777 Nurarihyon no Mago vol.14
45, *,350,238 One Piece vol.3
46, *,345,097 One Piece vol.58
47, *,340,851 Ahiru no Sora vol.30
48, *,336,091 One Piece vol.4
49, *,333,209 One Piece vol.5
50, *,328,300 Toriko vol.12

Series by series (copies)
*1, 23,366,030 One Piece
*2, *3,110,842 Gantz
*3, *3,035,593 Naruto
*4, *2,613,851 Shingeki no Kyojin
*5, *2,501,768 Fairy Tail
*6, *2,471,448 Bakuman
*7, *2,421,162 Kimi ni Todoke
*8, *2,332,551 Gintama
*9, *1,980,234 Bleach
10, *1,836,000 Toriko

Source: Oricon