The Mormon Church has created a lot of great videos. They can be found on YouTube at the Mormon Channel and elsewhere, such as on the Church's website for youth. I've enjoyed the mormon.org profiles as well (also available at the Mormon Channel) -- it's fun to "meet" different members of The Church of Jesus Christ of Latter-day Saints.
But I think the following video of the youth at the Kiev Ukraine temple dedication time (talking about their youth celebration) is one of my all-time favorites.
For those not of our faith, this post that features the youth cultural celebration video explains a little about why temples are so important to members of The Church of Jesus Christ of Latter-day Saints.