See Forumite in action.

The main Forumite screen, showing all the forums and threads which are monitored along with the activity log for the selected forum.

The Browser screen allows you to browse a forum's structure, providing an easy way to monitor multiple threads all in one go.

Forumite integrates directly into the right-click menu of both Internet Explorer and Firefox. Simply select Monitor Page with Forumite to start monitoring the thread or forum you are viewing.

Even when Forumite has been minimised to an icon in your notification area it still alerts you whenever a new thread or post has been detected.  Clicking on the alert takes you straight to the new thread or post in your web browser.