I did my first music video today with stable Kdenlive on Ubuntu 9.10 64bit. Everything worked really well.
Here's the video: http://www.youtube.com/watch?v=3tLPOJNTyxY
I have a crappy camera, but those Kdenlive-effects made some content to otherwise dull looking picture.
I didn't use any transitions, I still need to learn how to use them.
Kdenlive rules ok!