Kdenlive 0.7.7 and MLT 0.5 are ready in my stable series PPA.
Edit : If you are working with intrepid or jaunty you had a problem because I didn't upload at the same time kdenlive and mlt (this is stupid, I know, but I had more urgent tasks to do with by baby boy and then I forgot to finish the job). During the time lapse any upgrade failed with a missed dependency. Now it's ok and if you reload your package manager the upgrade will be smooth.
Edit 2 : If you are using ubuntu karmic with KDE 4.4, you must use my unstable ppa (ppa:sunab/sunab2)
Edit3 : both ppas have been updated to kdenlive 0.7.7.1