Last updated: 19/01/2013.
Any voice banks published after the above ngày will not be within this list.
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Japanese Voicebanks
Meiko
5 November
Kaito
17 February
Hatsune Miku
31 August
Kagamine Twins
27 December
Gackpoid Gakupo
31 July
Megurine Luka
30 January
Megpoid Gumi
25 June
SF-A2 Miki
4 December
Kaai Yuki
4 December
Hiyama Kiyoteru
4 December
Lily
25 August
VY1
1 September
Gachapoid Ryuto
8 August
Nekomura Iroha
22 October
Utatane Piko
8 December
VY 2
25 April
Mew
22 October
Tone Rion
8 December
CUL
22 December
Yuzuki Yukari
22 December
IA
23 January
Aoki Lapis
6 April
Mayu
5 December

English Voicebanks
Leon and Lola
5 January
Miriam
1 Miriam...

An updated danh sách of all the Vocaloid release dates, I'll try to update as new ones come out.

Vocaloid 1

Leon - January 15, 2004

Lola - January 15, 2004

Miriam - July 1, 2004

Meiko - November 5, 2004

Kaito - February 17, 2006


Vocaloid 2

Sweet Ann - June 29, 2007

Miku Hatsune - August 31, 2007

Rin Kagamine - December 27, 2007

Len Kagamine - December 27, 2007

Prima - January 14, 2008

Gakupo Kamui - July 31, 2008

Luka Megurine - January 30, 2009

Gumi - June 26, 2009

Sonika - July 14, 2009

SF-A2 Miki - December 4, 2009

Yuki Kaai - December 4, 2009

Kiyoteru Hiyama - December 4, 2009

Big Al - December 22, 2009

Tonio -...