Originally Posted by Helix

Video Responses: Approving video responses
If someone responds to your video, you'll get an email with their username and the title of the responding video. Click the "go to the Video Responses section of your Inbox" link in that email or just click "Inbox" in the upper right corner of the homepage. You'll be taken to a screen showing you several representative thumbnails and other information about the video. From your Inbox, you can approve, reject, or take no action on any pending video responses by selecting that action from the drop-down menu at the bottom.

http://help.youtube.com/support/yout...45&topic=10537