BlogBridge has to be a cutting edge RSS reader, as soon as a new concept is emerging they are on the forefront to experiment and deliver (they don’t stand back and watch others succeed or fail).
Anyway they are well on the way to delivering OPML reading lists.
In their words:
“A Reading List is a collection of Feeds maintained by one party for the benefit of another”
I really like the control a user has over the current status of a reading list, see the screenshot.
In essence this means you can subscribe to a dynamic OPML file that lives elsewhere, any changes made to this file will be reflected in your version, the great thing, as mentioned, is that you will have some form of notification or status of the reading list.