I've put together up-to-date development snapshot packages of ffmpeg (0.5+svn20090820), MLT (0.4.4+git20090820) and kdenlive (0.7.5+svn20090818) today for Jaunty.
If anyone else would like to have access to them I can push them into my Ubuntu PPA - please let me know here. I intend keeping each package updated at least once a week.
My requirement is to ensure I have the latest support for AVCHD as well as stability patches.

My development snap-shots are now available from my Ubuntu PPA:
https://launchpad.net/~intuitivenipple/+archive/video-editors
To configure a system to use my PPA do:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 29047922
Then:
echo "deb http://ppa.launchpad.net/intuitivenipple/video-editors/ubuntu $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/intuitivenipple.list
echo "deb-src http://ppa.launchpad.net/intuitivenipple/video-editors/ubuntu $(lsb_release -sc) main" | sudo tee -a /etc/apt/sources.list.d/intuitivenipple.list
sudo apt-get update
To install the packages do:
sudo apt-get install kdenlive
Note: Edited to reflect new name ("video-editors") of PPA