How to use 'Getit' button?

On these following website: Youtube, Metacafe, Dailymotion, Myspace and Google video, click 'Getit' button, the server will resolver it, and the video would be downloaded. As the pictures show:




On the other websites (except the above websites), click 'Getit' button will let Grab++ work.



Also, you can close the 'Getit' button by click the 'close'.
Go to the menuitem of Tools-Enable 'Getit' button for catching media, will let the 'Getit' button work again.