I've been working on and off on the Unnamed Semantic Web Client. After all this talk about Blog Browsers, I decided to add support for reading general XML and a XUL file that displays RSS. Screenshot

For XML support, the UI elements are bound to the RSS using XPath expressions. When the user enters something into the search field, the expression is changed, and the list updates to show the result.

Right now it only works for non-RDF RSS. I'll need to add something to detect RDF-based RSS as well.

Perhaps I'll package it into an XPI soon.