http://www.thefreedictionary.com/_/rss-directory.htm
This page provides you with many sites whose RSS Feed you can add to your own site. Those sites are also nicely categorized so you should be able to find something interesting for your subject area relatively quickly. Once you have found a title you are interested in, click on the orange ‘XML’ which you will direct you to that particular page where then you will need to click on the RSS Feed button.
WIRED @ MESCairo 