There are a lot of popular sites which don’t have RSS feeds to notify you of new content updates. But there is a way to get all the updates of these type of sites.

If you use Firefox then install Update Scanner firefox extension to monitor web pages for updates. Useful for websites that don’t provide Atom or RSS feeds.

When a change is detected, a notification window is displayed. Click the blue up-arrow on the bottom status bar to show the Update Scanner sidebar. Webpages that have been updated are shown in bold. Similar is the Firefox add-on Page Update Checker