Last updated: 19/01/2013.
Any voice banks published after the above date 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
Sweet Ann
29 June
Prima
14 February
Sonika
14 July
Big Al
22 December
Tonio
14 July
Oliver
21 December
Avanna
22 December

Other Vocaloid Voicebanks
SeeU
22 October
Bruno
23 December
Clara
23 December
Luo Tianyi
12 July

Official Derived Voicebanks
Megurine Luki
1 January
Tako Luka
8 January
Hagane Miku
18 January
Sakine Meiko
11 April
Mikuo Hatsune
7 June
Shion Akaito
14 July
Hachune Miku
4 September
Zatsune Miku
17 October
Neru Akita
1 November
Shion Kaiko
11 December
Sakine Meito
16 December
Haku Yowane
21 December
Rinto and Lenka
27 December

Utauloid Voicebanks
Kasane Teto + Ted
1 April
Uta Utane
5 Februrary
Matsudappoiyo
20 March
Momo Momone
22 May
Ritsu Namine
12 October
Luna Amane
19 October

Nico Nico Utaites
Hanatan
18 January
Mi-Chan
9 March
Piko
11 March
96neko
30 March
Che:Sakurai
6 April
Wotamin
20 April
Choucho
21 June
Nano
12 July
vipTenchou
14 July
Sekihan
13 August
Clear
27 August
Valshe
15 September
Soraru
3 November
ShounenT
26 December
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Please add the birthdays of your favourite Utau and Utaites in the comments so I can put it on the list! (Though I prefer popular ones, the less known ones are welcome as well)