I'm a student willing to participate in the SoC 2008 for Pitivi (GNome and/or GStreamer can be mentor organizations)
One idea can be found here: http://gstreamer.freedesktop.org/wiki/Pitivi
another one: http://live.gnome.org/SummerOfCode2008/Ideas/Moviestudio
The last one implies that created movies can be shared with others, but maybe this is not really the way to go, a real sharing/collection program of videos should be managed by another application.
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