I use Google Feeds API to power my RSS fetching for a couple applications. One inevitable problem with dynamically accessing RSS feeds is that they tend to be cached.
UPDATE 4/42015 - Removed the trailing '/' from the RSS URL below. The code will fail with Google Feed's API if you do not remove the trailing '/'. Alternatively, you may replace the ? with & if you wish to leave the slash.
rssFeed: 'http://examplesite.com/feed' + '?nocache=' + ((new Date).getTime()); //NoCache + cache-busting value