Nu Emo consists of: Hawthorne Heights, Taking Back Sunday, Senses Fail, and many other bands with ovaries (according to the flash emogame)
Subgenres of Nu Emo are: Post Harcore such as Underoath, Pop Punk such as Hit the Lights, Pop Rock such as Panic! At the Disco, and what some people like to think of as "Rock" which in their minds would be The Used. pshhh.
Other bands such as AFI can not be categorized as Nu Emo being that they started in the early 1990s. Yeah, bitches betcha didn't know that. But, of course look at them now. Two words: sold out.
Emo was basically started from a band call Sunny Day Real Estate. Another popular band is Dashboard Confessional which is totally mainstream as we know it today. Thanks MTV, thanks. But these two bands among several others are really considered to be of the alternative indie rock persuasion. Don't be fooled kids, MTV changes facts, perspectives, and opinions. It's evil; save yourselves.
Honestly, I don't know why people follow this crap.
Musical Mary: Okay, and what about 'Answer That and Stay Fashionable' or 'Very Proud of Ya'?
Jane: What? Um. 'Sing the Sorrow' was good too.
Mary: Yes, okay. Just go listen to your dumb Nu Emo, you mainstream MTV whore.