I use Google Reader which allows you to export everything.

  1 - click "Manage subscriptions", bottom left of the reader
      which opens the "settings" page
  2 - click "Import/Export" 
  3 - click "Export your subscriptions as an OPML file"

Now you have a nice XML representation which you can massage inside your editor of choice.

When you're done, prepend 2 spaces to the start of each line so HN will treat it like code.

Excellent, thanks. I'll have to try that and see what kind of RSS mess I have.