OMG, I'm a new Vocaloid fan now!...
and Len is sooooooooo cute! ...and I can't stop listening to Kokoro: [link]

Amazing drawing of Len: [link]
same drawing on da: [link]
and same drawing, but naked Len lol: [link]

Len has an awesomely cute voice too: [link] (and this is a very sad song)

There are also INSANE animation too: [link]
and beautiful musical+animation masterpieces: [link]

Plus, there are quite a lot of KaitoxLen. Love them! [link]

Random stuff:
And this Full Metal Alchemist parody is amazing: [link]
Len and Rin are adorable too: [link]

So in short, I got addicted and Len is SUPER CUTE!
(wow I got addicted to a synthesized voice...)