And for those of us who like to avoid the expat-based modules and prefer libxml2:

use strict;
use warnings;
use LWP::Simple 'get';
use XML::LibXML;
use CPAN;

CPAN::Shell->install(
    XML::LibXML
        ->new()
        ->parse_string( get( 'http://perladvent.org/perladventone.rdf'
+ ) )
        ->findvalue( '/rss/channel/item/title' )
);
[download]

Actually for the RDF feed currently provided you can just use //title as the XPath expression.