AMV: Anime Music Videos
Now here's a really old link that I'm going to lay upon you. AMV, or Anime Music Videos, is a secret favorite website of mine and one that any Anime fan should be aware of. AMV is a website which hosts, organizes and rates user submitted Anime Music Videos.
The best part about this website is that they host yearly awards, broken up into different categories, for the best videos of the year. It has become an obsessive habit each year to download every single video and watch them all. I seriously have no idea why it becomes so addictive to watch these videos, maybe it's just me.
In anycase, I recommend checking it out, and I suggest that you sign up and get a free membership. It's worth it.