compiz 0.9

If you are familiar with GNOME 3, you probably observed its new awesome animation (if you, for instance, open "Gedit" and click Help-->About, the new window has a really interesting "unfolding" from top to bottom).

If you use the compiz-based Unity in Natty Narwhal (or Maverick, Lucid, etc) there is an effect, "Burn", that, after some tweaking, "looks" exactly like the above mentioned effect.

A compiz/unity ppa was launched for Natty bringing only borderless windows, instability and freezing screens. You cannot run unity/compiz duo in a virtualbox (for the moment), for the brave and cutting edge people you can try natty daily build with compiz/unity PPA.