I was about to upload a video on YouTube for the first time (ever!) and I noticed that I was missing Movie Maker type of application in Linux, After searching for a few minutes I found this post about "Top 10 Free Video Editors for Ubuntu Linux", well I decided to try some of them.
if you want a quick recommendation for a simple app, go for Avidemux, in case you are looking for more advanced features go for Cinelarra. Finally Kino maybe somewhere in between.