Kono BL Ga Yabai! 2013

From what I've gathered reading about it online, Kono BL ga Yabai! (このBLがやばい!) is an annual publication in Japan that compiles a ranking list of BL manga (and one for BL novels) published in the last year based on reader votes. The 2013 edition was published in December 2012 and covers manga published between 2011 Oct - 2012 Sep. Here's the top 20 manga:

1.  Sora to Hara by Nakamura Asumiko

2. Yuutsu na Asa 4 by Hidaka Shouko

    (Licensed as Blue Morning in English by Sublime)

3. Iberico Buta to Koi to Tsubaki by Shoowa

4. Shinjuku Lucky Hole by Kumota Haruko

5. Bukatsu no Kohai ni Semarareteimasu by Koshino

6. Hana no Mizo Shiru 3 by Takarai Rihito

   (Licensed as Only the Flower Knows in English by DMG)

7. 500 Nen no Itonami by Yamanaka Hiko

8. Hatsukoi no Atosaki by Hidaka Shouko

9. Koketsu Dining by Moto Haruhira

10. Kare no Barairo no Jinsei by Hideyoshico

11. Boku no Senpai 2 by Habuyama Hebiko

     (Licensed as My Sempai in English by DMG)

12. Papa's Assassin by Shoowa

13. Koisuru Boukun 8 by Takanaga Hinako

     (Licensed as The Tyrant Falls in Love in English by Juné)

14.  Senpai by Bikke

15. In These Words by Guilt|Pleasure

    (Self-published in English by Guilt Pleasure and also by 801 Media)

16. Kanemochi-kun to Binbou-kun by Hideyoshico

17. Akunin wo Nakaseru Houhou by Amagakure Kido

18. Yagi-san Yuubin by Kusama Sakae

19. Hitorijime My Hero by Arii Memeko

20. Endou-kun no Kansatsu Nikki by Hayakawa Nojiko









For comparison, here are the Kono BL ga Yabai! rankings from previous years (where licensed in English, publisher is shown in brackets):

2012 edition

1. Samejima-kun to Sasahara-kun by Koshino (Juné)
2. Merry Checker by Suzuki Tsuta
3. Ze by Shimizu Yuki (801 Media)
4. Yuutsu na Asa by Hidaka Shouko (Sublime)
5. Castle Mango by Konohara Narise and Ogura Muku (Juné)
6. Equus by Est Em
7. Smoker by Inoue Satou
8. Ameiro Paradox by Natsume Isaku
9. Boku no Senpai by Habuyama Hebiko (DMG)
9. Match Uri by Kusama Sakae (Sublime)
11. Mahiru no Koi by Kusama Sakae
12.  Acchi to Kocchi by Koshino
13. Yoromeki Banchou by Yorita Saemi
14. Itoshi no Nekokke by Kumota Haruko (JManga)
15. Nijiiro Mura no Chirori by ARUKU
16. Sawattemo Ii Kana by Matsumoto Miecohouse
17. Aru Mystery Sakka to Sono Tantou Henshuu ni Matsuwaru Kiroku by London Pariko
18. Neko no Yomeiri by Kojima Lalako (Juné)
19. Junai Ero Ki by Psyche Delico (DMG)
20. Boku wa Subete wo Shitteiru by Takaku Shouko (Juné)

2011 edition

1. Sotsugyousei by Nakamura Asumiko (DMG)
2. Ze by Shimizu Yuki (801 Media)
3. Nobara by Kumota Haruko (DMG)
4. 1-en no Otoko by Monden Akiko
5. Koisuru Boukun by Takanaga Hinako (Juné)
6. Sorenari ni Shinken nandesu by Asou Kai (Juné)
7. Haru wo Daiteita by Nitta Youka (Sublime)
8. Sen - Rasen no Jou by Okadaya Tetuzou
9. Soshite Tsuzuki ga Aru no Nara by Uchida Kaoru
10. Inu wa Yumemite Koi wo Suru by Natsumizu Ritsu
11. Ookami no Ketsuzoku by Inoue Satou
12. Uso Mitai na Hanashi desu ga by Koshino 
13. Oyajina! by Hiiragi Nozomu
14. Usagi Otoko Tora Otoko by Honma Akira (Juné)
15. Utsukushiku Moeru Mori by Yorita Saemi
16. Karenai Hana by Kyouyama Atsuki (DMG)
17. Hito wa Naze Hataraka Nakereba Naranai no ka by Yamada Yugi
18. Aitsu no Daihonmei by Tanaka Suzuki (Sublime)
19. Jin to Neko wa Yobu to Konai by Shoowa
20. Hana wa Saku ka by Hidaka Shouko (Juné)

2010 edition  

1. Sojou no Koi wa Nido Haneru by Mizushiro Setona
2. Double Mints by Nakamura Asumiko (DMG)
3. Viewfinder by Yamane Ayano (Juné)
4. Terebi-kun no Kimochi by Matsumoto Miecohouse
5. Seven Days by Tachibana Venio and Takarai Rihito (Juné)
6. Taka ga Koi Daro by Yamada Yugi (DMG)
7. Sarukuiyama Gigoku Jiken by Harubaru Aruku
8. Sentimental Garden Lover by Ogura Muku (DMG)
9. Kozure Ookami by Inoue Satou
10. Manin Onrei by Maki Ruis (DMG)
11. Koisuru Boukun by Takanaga Hinako(Juné)
12. Tsubaki Biyori by Ishino Aya
13. Aitsu no Daihonmei by Tanaka Suzuki (Sublime)
14. Ze by Shimizu Yuki (801 Media)
15. Orutana by Furutsuji Kikka (DMG)
16. Ai Kurai Chanto by Yorita Saemi
17. Gad Sfortunato by Basso
18. Koi no Hanashi ga Shitai by Yamashita Tomoko (DMG)
19. Wakudeki Shumi by Meiji Kanako 
20. Boku no Shiru Anata no Hanashi by Suzuki Tsuta (Juné)

2009 edition

1. Doukyuusei by Nakamura Asumiko (JManga/DMG)
2. Aitsu no Daihonmei by Tanaka Suzuki (Sublime)
3. Doushitemo Furitakunai by Yoneda Kou (Juné)
4. Arashi no Ato by Hidaka Shouko
5. Illumination by Yamashita Tomoko
6. Junjou Romantica by Nakamura Shungiku
7. Koi no Kokoro ni Kuroi Hane by Yamashita Tomoko (Netcomics)
8. Doushiyoumo Nai Keredo by Natsume Isaku
9. Yuri Sensei wa Kyou mo Joukigen by Kinoshita Keiko (DMG) 
10. Irome by Kusama Sakae
11. Seitokaichou ni Chuukoku by Monchi Kaori (801 Media) 
12. Tonari no by Koshino (DMG)
13. Arienai Futari by Yamada Yugi
14. Endorphin Machine by Inoue Satou
15. Sawatte Tokashite by Kobato Mebaru
16. Mirai no Kioku by Kunieda Saika
17. Touch Me Again by Yamashita Tomoko
18. Teppen Kaketaka by Ishihara Satoru (DMG) 
19. Ze by Shimizu Yuki (801 Media)
20. Ikemasen, Oujisama! by CJ Michalski

2008 edition 

1. Ze by Shimizu Yuki (801 Media)
2. Kuimonodokoro Akira by Yamashita Tomoko (Netcomics)
3. Junjou Romantica by Nakamura Shungiku
4. Akanai Tobira by Suzuki Tsuta
5. Sex Pistols by Kotobuki Tarako (Sublime)
6. Nikushokujuu no Table Manner by Kusama Sakae 
7. Yume Miru Seiza by Kusama Sakae
8. Darenimo Aisarenai by Yamada Yugi (Juné)
9. Kawaii Hito by Konno Keiko
10. Kiss Blue by Kinoshita Keiko (Juné)
11. Viewfinder by Yamane Ayano (Juné)
11. Gerard to Jacques by Yoshinaga Fumi
13. Gokujou no Koibito by Minase Masara
14. Koisuru Boukun by Takanaga Hinako (Juné)
15. Mahoutsukai no Koi by Miike Romuco
16. Zenryaku - Dear by Tojitsuki Hajime
17. Sakura ni Aitara by Furutsuji Kikka
18. Gengetsurou Kitan by Ima Ichiko
19. Barairo no Hoo no Koro by Nakamura Asumiko
20. Amato Amaro by Basso

Going by these lists, the most popular mangaka is Nakamura Asumiko, who took the #1 spot in 2009, 2011 and 2013. The mangaka with most entries over the past few years is Kusama Sakae. Other perennial favourites are Koshino, Hidaka Shouko and Yamashita Tomoko.