Matt Cutts informs on his blog that you can now upload "unlisted" videos to Google video. The webmaster help page explains "If you have a video you'd rather notshare with the entire world, you can choose to restrict access to it by marking it as "unlisted". Similar to an unlisted telephone number that isn't available in public phone number databases, videos that have been unlisted are not accessible through Google Video search results. This option is especially useful for family videos. Just set your video to "unlisted" and email the link to your family and friends."