Once again, the mad syndication ninja has elevated his art with Feed on Feeds 0.16, adding XHTML and CSS, a one-page console and viewer, and a lot of bug fixes. Go forth and download!
(Kellan McCrae, the author of the parsing library that sits at the core of Feed on Feeds, has also started experimenting with ways of extending the tool to allow both consumption and production of syndication feeds, and released a patch that allows you to republish posts into your own feed. Very, very interesting.)