The Justin Timberlake/Corey hart video Sexyback Sunglasses was HUGE on Youtube last year, until the account was shut down. At the last count it had over 550,000 views!!
It has resurfaced on a few sites:
AOL: Click here
Daily Motion: Click here
and might even make a new appearance on youtube in the next few days ;)
Edit: It already has! Click here (best quality version)