AkelPad: Open source editor for plain text, designed to be small and fast, supports multi window mode, Unicode text, preview of files before printing, drag and drop, syntax highlight (via plugin), user created colour schemes and much more.
TED Notepad: Highly configurable Notepad editor with autosave, Ted Notepad is targeted at advanced users with most of its functions having a hotkey, appearance (font&background colour) can easily be changed in settings. Text formatting, HTML support, search&replace, full screen, etc.
Notepad2: Light weight (560Kb) Notepad like text editor with syntax highlighting, it can be run in portable mode without installation and it will not leave any trace in the Windows registry. Supported syntax includes HTML, XML, CSS, VBScript, CGI, SQL query, this editor is ideal for web authoring.
MetaPad: Portable multilingual editor (GPL licensed) that will save the settings on the USB thumbdrive not leaving any data behind. It has persistent window placement, find and replace text, Unix text file support, recent file list, hyperlink support and dual font.
EditPad Lite: General purpose text editor to edit any kind of text file, it has a tabbed interface to work with many files at once, automatic back up to prevent data loss, search and replace feature, undo/redo editing, full Unicode support and it works with Windows and Unix text strings.
Notepad ++: Open source Windows Notepad replacement editor based on Scintilla, a powerful programmers editor, Notepad ++ has a numerous community and is actively in development, features can be extended via plugins, expect a spell checker, FTP client, and macros.
PSPad: Free editor for developers, it can be used as a web authoring tool to create webpages or IDE compiler for programmers, macros can be used to automate repetitive tasks, it comes with an HEX editor, FTP client and Macro recorder, this editor is best suited for people into web development (programmers).
Vim Editor: Very geeky cross platform (Linux, BSD, Windows) text editor widely used by developers. Multiple clipboards, macros support, powerful configurable search capabilities, built-in scripting engines to automate tasks, sophisticated keyboard short-cuts and portable.