MSN Search beta returns your search results as RSS. On the search results page view source. Right after the copyright statement you will notice <div id="rss_feed" class="clear"> and a link to the RSS feed for your search. Use the parameter q for your keywords (properly escaped of course) and the format parameter should be rss.
- http://beta.search.msn.com/results.aspx?q=Feedster&format=rss
- http://beta.search.msn.com/results.aspx?q=Technorati&format=rss
Very interesting. Yes, Feedster and Technorati will still have a fresher index, but they now have to make a stronger business case. You can add {frsh-100} to your query string to give fresher results a higher weighting but the search results are not LIFO, leading to constantly changing results due to the weightings of MSN.