When Google Chrome launched, many people complained that the browser didn't detect feeds. Apparently, this feature has been implemented in an extension that will come preinstalled in Google Chrome.
The extension "adds a button to the URL bar when a page has a feed that can be subscribed to". When you click on the orange button, the extension previews the feed and it lets you subscribe using a feed reader.
The support for extensions is only available in Chrome's dev channel. Google will soon launch an extension directory at https://chrome.google.com/extensions and the first beta version that supports extensions will be released in early December.