Best RSS resources?

This should be an easy one, as I have plenty of bookmarks, but I’d like to throw this question out there: What are the best sources for RSS information online?
Here are some dredged quickly out of my browser’s history:

There are definitely a other fairly obvious resources that should be added to this list (just don’t have the URLs handy—next KM practice will be searching this site, then looking at my bookmarks, and finally some free-associative browsing), but this is a good start.
I can think of a few that are missing. Can you?