"We're very impressed with the videos that have been contributed so far," Asa Dotzler, Mozilla community coordinator, said in a statement. "Our community is not only producing some great ads, they are also having a lot of fun."
You can learn more about the contest at firefoxclicks.com. Some of them are quite humourous, and for amateur work are definitely worth watching. I was only able to see a total of 3, but reading the site's blog reveals that soon the video collection as a whole will be made available.