Here is the weekly manga sales ranking for December 21st - 27th.

*1, 886,135 *,886,135 Fullmetal Alchemist vol.24
*2, 488,446 *,488,446 Hunter x Hunter vol.27
*3, 301,130 *,301,130 Ookiku Furikabutte vol.13
*4, 281,589 *,281,589 xxxHOLiC vol.16
*5, *98,347 *,211,108 Kekkaishi vol.27
*6, *87,398 *,*87,398 Higurashi no Naku Koro ni Kai Minagoroshi-hen vol.4
*7, *85,847 *,*85,847 Umineko no Naku Koro ni vol.4
*8, *85,259 *,*85,259 Higurashi no Naku Koro ni Kai Matsuribayashi-hen vol.3
*9, *81,252 *,202,559 K-ON! vol.3
10, *79,549 *,*79,549 Suzumiya Haruhi-chan no Yuutsu vol.4

11, *77,615 *,*81,915 Shinseiki Evangelion: Ikari Shinji Ikusei Keikaku vol.9
12, *76,978 *,158,757 Major vol.74
13, *76,019 *,*76,019 Mei-chan no Shitsuji vol.11
14, *69,650 *,*69,650 Umineko no Naku Koro ni - Episode 2: Turn of the Golden Witch vol.2
15, *67,060 *,*67,060 Zipang vol.43
16, *66,168 *,*66,168 Initial D vol.40
17, *65,732 *,*65,732 Sekirei vol.9
18, *64,597 *,*64,597 Bokutachi wa Shitte Shimatta vol.8
19, *61,151 *,193,744 Hajime no Ippo vol.90
20, *60,554 *,188,611 Air Gear vol.27

21, *59,535 *,*59,535 Nagasarete Airantou vol.16
22, *59,339 1,924,398 One Piece vol.56
23, *58,972 *,*58,972 Suki desu Suzuki-kun!! vol.6
24, *58,155 1,042,231 Nodame Cantabile vol.23
25, *56,504 *,*59,116 Ga-rei vol.11
26, *54,811 *,130,749 History's Strongest Disciple Kenichi vol.36
27, *53,651 *,*53,651 Fate/stay night vol.11
28, *53,291 *,*53,291 Uchuu Kyoudai vol.8
29, *50,862 *,145,544 GTO: Shonan 14 Days vol.2
30, *47,738 *,*47,738 Higurashi no Naku Koro ni Hirukowashi-hen

Source: Oricon manga ranking
Japan's Weekly Manga Ranking for Dec 14 - 20

Weekly Light Novel Ranking for Dec 21 - 27
*1, 42,170 78,175 Seitokai no Ichizon vol.7
*2, 41,028 41,028 Baka to Test to Shoukanjuu vol.7
*3, 22,925 50,399 Uchi no 3 Shimai vol.11
*4, 19,372 19,372 Kampfer vol.11
*5, 17,975 17,975 Hidan no Aria vol.5
*6, 17,793 17,793 Infinite Stratos vol.3
*7, 16,853 16,853 Maria-sama ga Miteru vol.37
*8, 14,267 34,968 Theater!
*9, 13,135 13,135 Ushiro wa Ma no Tsuku Ishi no Kabe
10, 11,965 11,965 Bungaku Shoujo Side Story vol.2 with OVA
11, 11,255 11,255 Cu Cu Cute! vol.11

Source: Oricon Novel ranking