To create an RSS feed in Bing, conduct a search, and at the end of the URL from the search results screen add the following text: &format=rss. For example, here is the URL for a Bing search of Lance Armstrong: http://www.bing.com/search?q=lance+armstrong&go=&form=QBLH&qs=n. Here is the URL to turn the search into an RSS feed: http://www.bing.com/search?q=lance+armstrong&go=&form=QBLH&qs=n&format=RSS.
Please note that RSS feeds can only be created for website searches, not for video or image searches.