Animoto

Animoto is a video making site

Advantages

• You can make your very own videos by turning your photos, video clips, and music into wonderful masterpieces to share with your friends and family.
• It is fast simple and really easy, just create an account and you can start making your own personal 30 second video for FREE!

Disadvantages

• If you want to make a video longer than 30 seconds it's not free

I think this is one of the best sites, because it's really fun to organize your own photos and clips into a video. The videos are also in very good quality, your pictures turn out very clear and the themes are all very pretty.