Video editing usually requires installing specialized video editing software on your computer, but Google wants to change that and is currently testing Youtube Video Editor for making the whole process easy and fun and that too online - requiring just a web-browser to get the task done.
Without installing any software, it allows you to:
* Combine multiple videos you’ve uploaded to create a new longer video
* Trim the beginning and/or ending of your videos
* Add soundtracks from our AudioSwap library of tens of thousands of songs
* Create new videos without worrying about file formats and publish them to YouTube with one click -- no upload necessary
Try the beta Youtube Video Editor at - http://www.youtube.com/testtube .