The video i believe you're referring to rearranges the ipod options (Playlists, songs, artists, podcasts, videos, etc). That can be changed by going in the Ipod, selecting more, then clicking edit. Just drag the options that you want down to the menu.
As for the Main app window, I doubt you'll ever be able to select which apps appear at the bottom, since Jobs made such a big deal about the Four Big Things (Phone, Mail, Internet, iPod)