Watch it, buster!

Want to know about changes to the websites of your competitors, suppliers, favorite news outlets, or, heck, the Jonas Brothers? WatchThatPage can help.

Once you register, it'll keep an eye on all the sites you specify, consolidate any changes, and provide you with an update in an email message or on a special webpage.

Another handy site is Trackle, which tracks everything from websites to air fares to local events to stock prices. You can even track mentions of your own name online. (Although Google Alerts does that as well.)