The video shows the following:

* The Iceweasel brwser with Flash and Java plugins.
* The Thunar file manager with XDG directories.
* Double-clicking an audio file to play it in MPlayer.
* Using Quod Libet to manage music.
* Double-clicking a WMV file to play it in MPlayer (the slowness is due to the VM).
* Pidgin.
* Gimp.
* Other stuff.

Watch here

Also: Demo Video of the Gnome Pre-seed