Your favorite site doesn't provide news feeds?
This free online service converts any web page to an RSS feed on the fly.

With Feed43, you can create feeds by defining rules to extract text snippets from web pages 1. Each time the feed is accessed, Feed43 will load the source page and use these rules to build its up-to-date representation in RSS format 2. Add the feed to your favorite news aggregator 3 to get notified about web page changes.