I am quite happy with WinSyntax (
http://www.winsyntax.com/).
Super uber light, nice code colouring and it doesnt do any dumb sh1t of it's own like some other editors. I like my code as I coded it, not how some other editor thinks it should be coded.
Edit: I have just downloaded notepad2, and it seems really cool.
One question for those that use it: How can I open multiple files in it? It doesnt seem to support that, unless I have just not found how yet?
![EEK!](images/smilies/confused.gif)