I've been using Notepad++ for a while now, but I noticed it doesn't have code snippets (I found the QuickText plug-in, but it doesn't work anymore), so I'd like to switch editor and my requirements would be:
What are you using?
The E Text Editor (clone of TextMate for Windows) is worth a look. It supports all TextMate snippets, has a file tree view (watch the screencast), has multiple themes, and starts up relatively fast.