The plugin adds an Understudy menu item to the Front Row interface. You can use it to add feeds from those two streaming services (e.g. most popular, etc.) or URLs from the clipboard. Frankly, if it were me I think I'd go whole hog with Boxee, but if you're happy with Front Row but want to add a little streaming content, Understudy is worth a look.
Understudy is a free download from Google Code.