I wish someone (not my game, so it's best if it's not me) would combine: - hastebin's elegant, simple and pretty UI; - ideone's IDE features (compiling, running, debugging, ...) - gist's concept of making pastes git repos with easily accessible history

http://www.stypi.com/ ?

Looks good, but fails at ideone's features. Also, not a git repo, although history is nice. In other news, I think you just replaced etherpad lite for me.

Here's a clone of Gist that I like, the other features could be added via a fork - https://github.com/justinvh/quark-paste

I like http://paste.lisp.org.

Right now it does not have realtime highlighting, but I think it is obvious to the first-time user what to do. Personally, I like the simple and easy-to-use interface as well as the information and control it gives you at the same time.

Here is an example paste:

http://paste.lisp.org/display/127268