A way to use the compositor inside the sequencer, very useful but only for blender 2.49
This video can be considered both a tutorial for a powerful use of the compositor in the sequencer
and a request to developers the blender 2.5
When you edit a video in the sequencer many times happen to need the compositor.
the normal procedure would be to upload the video in the compositor and render a new video to be imported into the sequencer.
But blender 2.49 has a much more interactive possibilities, why this possibility was taken off in ver 2.5 (at least until alpha1)?
Fernando Luceri

http://www.blendernation.com/blender-developer-meeting-minutes-february-7-2010/
Follow > # Tom Musgrove started a forum thread ( url: http://blenderartists.org/forum/showthread.php?t=178149 ) to collect all crucial missing 2.4x features.
thanks whimsy!
You got it!
aka whimsycoll @blenderartists.
By the way, in Blender 2.50. You might want to try this out. Ctrl+ALT+W (Duplicate Window) then switch the scene.001 or whatever name the scene is. By then, you have two blender windows open with two different scenes. I know that in Blender 2.49 it’s not possible.