Here is the weekly manga sales ranking top 30 for May 11th - 17th.

*1, 124,638 *,124,638 Fairy Tail vol.15
*2, 112,824 *,112,824 Mahou Sensei Negima! vol.26
*3, *99,994 *,*99,994 Tsubasa RESERVoir CHRoNiCLE vol.27
*4, *76,035 *,*76,035 Bloody Monday vol.11
*5, *65,529 *,864,708 Naruto vol.46
*6, *59,132 *,*59,132 Yamato Nadeshiko Shichi Henge vol.23
*7, *56,277 *,*56,277 Costume Play ★ Animal vol.11
*8, *55,365 *,*55,365 Sayonara Zetsubou Sensei vol.17
*9, *50,204 *,374,275 Ouran High School Host Club vol.14
10, *41,826 *,*95,911 Hanma Baki vol.18

11, *41,138 *,*41,138 Kinkyori Renai vol.4
12, *38,145 *,*81,997 Baki Gaiden - Scarface vol.5
13, *34,428 *,*34,428 Seitokai Yakuindomo vol.2
14, *33,302 *,*51,609 flat vol.2
15, *32,628 *,*32,628 Mahou Sensei Negima! vol.26 Limited Edition
16, *28,442 *,*28,442 Shibatora vol.12
17, *28,006 *,*28,006 Godhand Teru vol.46
18, *24,643 *,205,876 Claymore vol.16
19, *24,506 *,*24,521 Aoi Honoo vol.2
20, *23,909 *,*23,909 Inochi vol.2

21, *23,869 *,*23,869 Short Program Girl's Type
22, *20,854 *,*20,854 Smash! vol.13
23, *19,878 *,*19,878 Tsubasa RESERVoir CHRoNiCLE vol.27 Limited Edition with OVA
24, *19,006 1,068,430 Fullmetal Alchemist vol.22
25, *17,467 *,200,971 Eyeshield 21 vol.35
26, *17,367 *,166,854 Toriko vol.4
27, *14,976 *,150,975 K-ON! vol.1
28, *14,967 *,151,301 K-ON! vol.2
29, *14,811 *,151,693 Gintama Character Book vol.2 Gintama Gonensei
30, *14,477 *,102,921 Sengoku Tenshouki vol.5

The last week's ranking: Japan's Weekly Manga Ranking For May 4 - 10
Source: Oricon Comic Ranking

Additional info:
A live action movie based on Tezuka Osamu's manga "MW" will be premiered on July 4th. Preceding the movie, a special live action TV drama was announced to be aired on June 30th.

Picture of one of the scenes
Yamada Takayuki (left) and Tamaki Hiroshi (right) play the main roles.

Source: Natalie

School Rumble Z ended on May 20th in Magazine SPECIAL June issue. The love story of School Rumble has concluded in the final chapter (spoiler).

Source: Natalie

Weekly Light Novel Ranking for May 11 - 17

*1, 30,063 *58,086 Spice and Wolf vol.11
*2, 13,791 147,755 Saiunkoku Monogatari Side Story vol.4
*3, *8,618 *19,896 Denpa Onna to Seishun Otoko vol.2
*4, *7,621 *16,669 Okami-san to Tottemo Otome na Bunbuku Chagama

Source: Oricon Novel Ranking