Regarding Dave Winer proposal to create a share your opml app, I’ve put up a test site at:

http://dev.glistn.com

Just testing functionality. This is a development site!

1. Join

2. Upload OPML file

3. Edit permissions of the individual feeds in the OPML by clicking on View files and then on [edit] next to the file you want to change. Submit it.

4. Now your permission based OPML will be available (only after you have edited permissions at least once)

5. View the OPML and share it at http://my.glistn.com/username/filename/

This file is hosted at Amazon s3.