In Leopard — the best version of Mac OS X ever — the versatile Mail program offers a great new feature. Its built-in RSS support lets you read the RSS feeds you subscribe to. That means you can use the same application to read both your mail and your favorite RSS feeds.
Let’s say you visit the Apple Hot News page all the time and would like to be notified when new Hot News articles appear. To do so,
To browse the feeds, simply click on Apple Hot News and Mail displays the headlines of all the articles in the Message pane. Click any of the headlines to have the Hot News article displayed in full. To visit the source of the Hot News article, click the Read more link, and Mail will open (or switch to) Safari and display the page.