Masher

From site:  Masher let’s you easily create a video by mashing together video clips, music tracks and photos. So you can create a video to brag about your holiday, to wish your friend happy birthday, or to show off your creative side. Whatever you have to say, a video speaks a squillion words, so get mashing!

Masher was created in 2008 and has an incredible built-in library of footage and music that you can use in your creations for free. The free video library archive features thousands of high quality clips, including footage from CBS News, BBC Motion Gallery, China Central Television, NHK Japan, Australian Broadcasting Corporation, Rip Curl, Huntley Archives and many more. The music has been provided by Audio Networks and Slam, experts in online music and production.

Mix, Mash, and Share.

Now go get mashing!