• Fix mixing and matching of RSS and Atom
  http://rt.cpan.org/Ticket/Display.html?id=21335
  (Shlomi Fish SHLOMIF)
  
• Note that multiple categories was fixed at some point
  http://rt.cpan.org/Ticket/Display.html?id=30234
  (mattn)
  
• Work with xml:base (depending on version of XML::RSS)
  http://rt.cpan.org/Ticket/Display.html?id=21135
  http://bugs.debian.org/381359
  (Gregor Herrmann and Joey Hess)