I've written a Google Chrome Extension, WebmasterWorld Favorite Forums
[chrome.google.com], which adds a "Favorites" section to the list of forums on the Forum Index
How it works:
Once installed, you will notice the WebmasterWorld icon in the address bar when viewing the Forum Index page. Click on the icon to open up the page for configuring your favorites.
The way it works currently is that you can add items to your Favorites, but they will still be sorted in the order that they appear naturally on the Forum Index page. In the next version, I'm going to add the ability to sort them (most likely with drag and drop functionality).
Comments/suggestions are welcome.