Here are some active communities engaged in video editing. These are mainly forums and discussion board where you can discuss about video. Most of these users should be interested in migrating to Kdenlive. So do not hesitate to advocate Kdenlive on those web sites.
0.8 - Kubuntu 10.10 - Xine?
0.8 HD Stop Motion Utility not listed in upcoming features
0.8.2 extremely slow
0.8.2 whats up?
0.8.3+git20111120 crashes all the time on Ubuntu 11.04