E is my new favorite text editor.
It's been around for a while, but it just recently started gaining a lot of momentum when the author made it his mission to turn e into TextMate for Windows.
In addition to supporting TextMate themes and bundles, e has an unlimited, branching undo buffer and built-in support for personal revision control, both of which are impossible to do without once you start using them.
If you write code in Windows, you owe it to yourself to try e.