We now have a list of OPML-compatible apps. It's a beginning, there are a bunch of apps that are not on the list. It's not just for editors, you can use OPML to pass outlines to apps that render outlines, for example, as a blog (that's Old School). There will be more of those. BTW, of course the list is an outline, and the OPML version is public, so you should be able to open it in any of the apps on the list. #