HTML to RSS Conversion?

For a variety of reasons I’ve been trying to find a simple way of converting plain HTML pages into RSS.
Does anyone know of a script that can do this?
It doesn’t matter which platform the script runs on, as long as it isn’t Apple Mac (as I dont’ have access to any)
Obviously I’d prefer if the script was linux based ie. php, perl or python, but I’m not adverse to using ASP if it does the job