I found Pitivi just not ready for use when I tried it, and IIRC, OpenShot didn't let me export after I'd edited, and Cinelerra and the editor built into Blender both crashed. Kdenlive was, I think, the one where I couldn't break off little clips of things, which made using a clip from a movie pretty unwieldy, with two hours in the timeline for a 10-second clip, but it was the one that looked like it was closest to being the right thing. Maybe I should give it another shot, especially now that I've got a better machine to run it on.