What are the most viewed viral videos of all time? Visiblemeasures.com recently came out with an estimation which compilies the hits recieved from every video from the most popular video sharing websites. See below for those who made it into the 100million club:

The Visible Measures 100 Million Views Club: May 1, 2009
Rank Title Type Label / Studio True Reach Months Available
1 Soulja Boy: Crank That Music Video Universal 356,300,000 21
2 Twilight Movie Trailer Summit 266,500,000 14
3 Mariah Carey: Touch My Body Music Video Universal 230,200,000 14
4 Jeff Dunham: Achmed the Dead Terrorist User Generated - 196,500,000 19
5 Susan Boyle (Britain’s Got Talent) TV Show Freemantle/iTV 186,000,000 0.7

Source: http://www.visiblemeasures.com/news-and-events/blog/bid/9262/The-100-Million-Views-Club-the-Most-Watched-Viral-Videos-of-All-Time