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Having to type in feed URLs, or grep them from view source (as you don't use the browser specific system) can be a pain.

The Google AJAX APIs team has created a simple way to find feeds, and to locate feeds in a URL.

findFeeds will do a Google search and return entries and feeds related to the search.

Here is an example at work:

The code you will write will look like this:

google.feeds.findFeeds(query, function(result) {
  var el = document.getElementById("feedControl");

  if (result.error || result.entries.length <= 0) {
    el.innerHTML = 'No Results Found';
    return;
  }

  // create a feed control
  var feedControl = new google.feeds.FeedControl();

  // Grab top 4..
  for (var i = 0; i < 4; i++) {
    feedControl.addFeed(result.entries[i].url, result.entries[i].title);
  }

  feedControl.setLinkTarget(google.feeds.LINK_TARGET_BLANK);
  feedControl.setNumEntries(2);
  feedControl.draw(el);
}

function newSlideShow(user) {
  showStatus('Resolving feed for ' + user);
  var url = 'http://www.flickr.com/photos/' + user;
  google.feeds.lookupFeed(url, lookupDone);
}

function lookupDone(result) {
  if (result.error || result.url == null) {
    showStatus('Could not locate feed for user');
    return;
  }

  showStatus('Found Photo Feed');
  // We need to switch over from Atom to RSS to get Yahoo Media for slideshow..
  var url = result.url.replace('format=atom', 'format=rss_200');
  showSlideShow(url);
}