So what similarities to Death Note have you seen in other anime/manga/stories? Plot-wise, character-wise, script-wise...?
Take Digimon. I know it's old and childish, but still.
Think about it:
Yagami Raito/Light - Death Note
Yagami Hikari - Digimon
Hikari translates roughly as "shining light".
Also, Kira is an anagram of Kari (the dub name).
And then there's the hair.
Poor Light must have had a terrible childhood - dressing up as a girl and running around with strange creatures, ne? XD
Yes. I really felt the need to bring this up.