A simple shell script and the ascii2uni tool is all it takes to add RSS feeds to conky.
1. Add this line to your .conkyrc, adapting the path of the script and the http://... for your rss feed.
${execi 300 /home/brb/bin/conky-rss.sh http://www.nzz.ch/feeds/recent/ 4 2 | ascii2uni -a D}
2. Create a shell script in a folder like $HOME/bin: rss_conky.sh
Ref: http://ubuntuforums.org/showthread.php?t=1358302
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