Debian-Multimedia
Cinelerra is a very nice authoring tool as well as an editor.
http://cinelerra.org/
I like it.
Only thing you'll have to setup is SHMMAX is too small on most systems not specifically setup for video editing:
As root (or using sysctl.conf during bootup)
echo "0x7fffffff" > /proc/sys/kernel/shmmax
For systcl.conf add this line to it:
kernel.shmmax = 2147483647
And reboot.