@Stephen66515: Jarte is based on WordPad, but with extra features, and they say it can be run from a USB stick. The point about WordPad being bundled with Windows anyway is a good one, though.
@wraith808: I looked at AbiWord years ago, and wasn't impressed, but that was then and maybe now is better. I hadn't thought to look at porteableapps. Good idea, thanks.