The Hatsune Miku series official blog was updated today with notice that the Hatsune Miku Project Diva rhythm series has crossed the million mark in shipments. The figure includes the three PSP titles, Project Diva, Project Diva 2nd and Project Diva Extend.
To celebrate, Sega had the game's staff make this graphic:
The blog also hints that they'll be making a present of some form based around the graphic. Details will be announced later.