In previous editions of Safari, there has been an RSS icon on the right side of the address field; you could click on the icon to see and subscribe to a site’s feed, but that’s no longer the case in Safari 5. Now when you’re on something like a blog page, you see the new Reader button instead of the old RSS icon. But you can still get to a page’s RSS feed: click and hold the cursor over the Reader icon and a menu will appear giving you a Show RSS option.