Here's a summary:
10. Weezer - "Say It Ain't So" due to the popularity of "Pork and Beans" and Guitar Hero
9. A-Ha - "Take On Me" thanks to the literal video version
8. Blue Oyster Cult - "Don't Fear The Reaper" thanks to SNL's more cowbell skit
7. The Knife's "Heartbeat" thanks to Jose Gonzalez
6. Harvey Danger's "Flagpole Sitta" thanks to College Humor's lip sync video (which I'd never seen)
Lip Dub - Flagpole Sitta by Harvey Danger from amandalynferri on Vimeo.
5. Rush - "YYZ" thanks to Guitar Hero
4. Journey's - "Don't Stop Believing"
3. Hall & Oats - "You Make My Dreams" due to the video mashup with keyboard cat
2. Europe's "The Final Countdown" thanks to Arrested Development
1. Rick Astley's "Never Gonna Give You Up" - RICKROLL!