Limone-sensei (リモーネ先生) is a fellow on the popular Japanese video site NicoNico Douga. What is so special about him? He can sound like Itoshiki-sensei. Now, I'm sure he isn't the only one with this ability, but he is the only one (that I know of) that "rewrites" popular anime songs and sings them, Itoshiki style. And full of despair. His works include Zetsubou Desho Desho, and even a generally SZS themed Kumikyoku. His videos are even really nice, too.
If you already have an account on NicoNico, a list of his videos can be found here.
Some of his videos are already uploaded to Youtube, including Zetsubou Desho Desho?, JOINT, Danjo, and more which you'll have to find yourself because Youtube generally sucks.
Edit: Fixed two of the Youtube links because my loltube account got banned.
Modified by atlantiza, 06-17-08, 9:24 PM
ilu Mathes. thanks for awesome Beato sig. <3
ilu mah_marina. thanks for awesome Beato icon. <3