Sublime Text 2 is Arguably the best IDE editor
Sublime Text 2 is a powerful code and text editor with one of the coolest interfaces ever! I started using Sublime almost three months ago now and really love how most everything you might need to do has a keyboard shortcut. You don't have to move your hands much (like over to the mouse) once you get the shortcuts down (think like ctrl+c for cut and ctrl+v for paste, just expanded to other fuctions that sublime has).
With Sublime, you can select multiple parts of the text for faster editing (Ctrl+Shift+L to split the selection into lines and Ctrl+D to select the next occurrence of the selected word). Really cool feature.
You can do side-by-side editing using Sublime as well. I used to use notepad ++ for this, but I really like the Sublime editor better for this.
It's available for OSX, Linux and Windows as well. If you're a coder, I do recommend giving this one a try!