Notepad++ tiny, fast, awesome

Notepad++ has to be the coolest code editor for Windows that I have seen. It's written in C++ so it is miniscule. It has boatloads of features/functionality/plugins/languages-support, yet it is lightning fast and has a tiny footprint on your memory.

Because there is no "project management" guff, it's perfect for file associations. It launches quickly for instant double click gratification.

I only just found it, and I'm lovin it.

If you use Unix, you can use Scintilla which N++ was based on.