Just got the Jetbrains newsletter, and one of the plugins they mentioned is Floobits: Touring Floobits plugin.
Floobits allows for remote sharing of code either through its own built-in editor, or through supported editors. They currently support vim, emacs, Sublime Text and IDEA.
They have a podcast which quickly shows it in action and it looks quite impressive.
If you’re looking to do pair programming with someone, and you’re not in the same place, worth checking out.