Turns out they do them almost every other day. :o

I'll merge the threads as each round finish.

http://www.internationalsaimoe.com/voting/

My votes:

ARENA 01: [Hiiragi Kagami]  Kushieda Minori
ARENA 02: Nakano Azusa  [Fujibayashi Kyō]
ARENA 03: [Hirasawa Ui]  Shiina Minatsu
ARENA 04: [Takamachi Nanoha]  Nymph
ARENA 05: Louise Vallière  [Katsura Hinagiku]
ARENA 06: [Saten Ruiko]  Saber
ARENA 07: [Fujibayashi Ryō]  C.C.
ARENA 08: [Shana]  Furude Hanyū
ARENA 09: Haramura Nodoka [Abstained] Akaba Chizuru
ARENA 10: Konjiki no Yami  [Aisaka Taiga]
ARENA 11: Sunohara Mei  [Akiyama Mio]
ARENA 12: [Suzumiya Haruhi]  Furude Rika
ARENA 13: Tōsaka Rin [Abstained] Holo
ARENA 14: Hiiragi Tsukasa  [Nagato Yuki]
ARENA 15: [Asahina Mikuru]  Shiina Mafuyu
ARENA 16: Izumi Konata [Abstained] Hirasawa Yui
ARENA 17: Kawashima Ami  [Sanzen'in Nagi]
ARENA 18: Ibuki Fūko  [Senjōgahara Hitagi]
ARENA 19: [Furukawa Nagisa]  Minami Chiaki
ARENA 20: [Okazaki Ushio]  Misaka Mikoto
ARENA 21: [Sengoku Nadeko]  Sakurano Kurimu
ARENA 22: [Maria]  Fukuji Mihoko
ARENA 23: [Ichinose Kotomi]  Ikaros
ARENA 24: Sakagami Tomoyo  [Saginomiya Isumi]
ARENA 25: Illyasviel von Einzbern  [Fate Testarossa]
ARENA 26: Harada Riku [Abstained] Rosemary Applefield


Extremely hard votes this time, especially ARENA 02 & 18..