Happy birthday to my favorite virtual idol Hatsune Miku! You were born exactly 6 years ago, but for all of us you will forever be 16 years old ^_^
You can also read the congratulations from my friends Ruben and Clara on their blogs.
On a side note, there has been news recently of the new english voice bank for Miku in Vocaloid V3. Its sounds rather good, still feels a bit weird to hear Miku speak english though.
To learn more about it you can go to the Vocaliod Wiki, or listen to a song on YouTube.