This is a cool site that lets you add captions to youtube videos.
Mailvu lets you send video e-mail. You can also embed it into your site, blog or VLC.
Celtx is great video project planning software.
Dragontape is great for remixing you Youtube videos and sharing them with your friends.
Tv Catchup lets you watch live TV online for free.
DotSub is a great site where you can transcribe any video, add subtitles and translate them.
Wevideo is a free video editing service that lest you edit up to 5gb of video online using a simple video editor. Even though the free videos are limited to 480p and you can only export 15 minutes of video free per month, it is still a great site for casual video editors.
(Featured image: M4D GROUP)