YouTube added an editing tool that lets creators of videos to make changes to snippets after they have been uploaded to YouTube. An "Edit Video" button allows changes such as adding effects, swapping soundtracks, or trimming clips right at Youtube.
Until now, when you uploaded to YouTube, your video was hosted and shared, but couldn't really be changed. But now, you can edit your uploaded videos right on YouTube. Video makers have lamented that strings of online comments and view count tallies are lost when works are removed for editing and then uploaded anew to YouTube.
If you don’t like the new version, you can revert to the original and save again. You can also save your edits into a new video and try out multiple versions. Note that popular videos with over 1,000 views and videos with third-party content can only be saved as new videos once edited.
Check it out at http://www.youtube.com/editor
