kdenlive just got better !

This video editor (my fav. because easy to use) - is now even better in version
0.7.5
http://www.kdenlive.org/
So far everything* works and no crashes. *Still problems with Theora encoding - I only get audio, but otherwise all is great.
You can add it to Jaunty using sunab's ppa:-

deb http://ppa.launchpad.net/sunab/ppa/ubuntu jaunty main

B5115B98AA836CA8 (gpg key) ..........

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com B5115B98AA836CA8

Edit:- Forgot to mention that you need the unstripped codecs, as follows:-
libavcodec-unstripped-52
libavformat-unstripped-52
libavutil-unstripped-49
libswscale-unstripped-0
libavdevice-unstripped-52
libavfilter-unstripped-0
libpostproc-unstripped-51

(Also ensure the 'melt' package is installed and is version 0.4.4)