In this screenshot, I am tracking portions of multiple web pages from a single location. The portions include the top headlines from WSJ.com, latest currency rate from Google, topics that are currently popular on Twitter and weather forecast again using Google search.
A lot of this information may not be available as RSS feeds but I can still check for updates across all the above web pages by simple reloading the above start page.
This was made possible through Fireclip, a Firefox plug-in that lets you select and slice out specific portions of any web page and puts them all on a single page.
You can later reload this page to track all clipped portions in one go without having to go to those sites to check for changes or new information.
For example, I can go to Google to determine the current exchange rate (e.g 1 USD in INR) and then clip out just the relevant portion, that lies between the search box and results, with Firelip. Watch video.
Video Screencast: How to Track Web Pages with FireClip
Microsoft introduced the concept of Web Slices in Internet Explorer 8 to help you monitor web sites from the browser itself but with a small limitation - it the website owner who actually decides what parts of his or her website can be subscribed to as a slice.
FireClip, as the video demonstrates, lets you clip any portion of any web page. Geeks may also want to try this Ubiquity tutorial to access portions of another webpage from anywhere else in Firefox.