I have started to work on a basic English translation for Crypton’s Piapro.jp – A site for all creations around the Vocaloid series – No matter if music, lyrics or even art.
To use the translation you have to use the wonderful Japanize or MyLingual greasemonkey script.
The translation I wrote up is still pretty basic, but it shall help to navigate a bit.
By the way, there is also a pretty good NicoNicoDouga interface translation going on on MyLingual as well. Check it out and help out by editing and improving the translations if you can!