Dynamic reading lists

After I wrote my del.icio.us as feed manager post, I realized that this is not a totaly new idea. It is what Dave Winer calls (dynamic) "Reading Lists".

Here are some interesting articles on reading lists, opml, etc:

• Raw » del.icio.us Reading Lists
• Use del.icio.us to build & share Reading Lists?
• Reading Lists: where are you?

Any other good resources/hacks on this?