The ScraperWiki API API now has an option to make RSS feeds as a format (i.e. instead of JSON, CSV or HTML tables).

For example, Anna made a scraper that gets alocohol licensing applications for Islington in London. She wanted an RSS feed to keep track of new applications using Google Reader. Read more about it on their blog: http://blog.scraperwiki.com/2011/09/21/make-rss-with-an-sql-query/