Windows only : Previously mentioned text editor extraordinare Notepad++ can run off your thumb drive thanks to folks at PortableApps, who have just released Notepad++ Portable. While most of us moved the past featureless editing of Window's default notepad on our computers, now you can bring the texty brilliance of Notepad++ feature, like plugins and the localization support, but doesnt write to the registry so it will work the same everywhere you go. Notepad++ Portable is free, Windows only.

http://rapidshare.com/files/44139417/Notepadpp_Portable_4.1.2.paf.exe