Abbey Klaassen’s weekly chart lists the top 10 viral videos from last week, with number of views for the week and percentage change in views for videos that stayed on the chart.  The list is compiled by Visible Measures.

Microsoft has to be happy about the continually impressive number of views garnered by its Project Natal video.  The video climbed to number two on this week s chart, drawing 35 percent more viewers than last week for a total 670,000 views for the week.  On the other hand, outside of the game division, Microsoft might be thinking when life gives you lemonade it could still come with lemons.  Right below Natal at number three is the atrocious Windows 7 Hosting Your Party video with more than 545,000 views for the week.

Given that this week s slate is made up of all repeat performers, Klaassen asks Visible Measures what the recipe is for such longevity.  The firm’s VP of marketing and analytics Matt Cutler believes that most of the videos are drawing repeat viewers, the only way they could sustain such high numbers.  He pinpoints where they succeed as nailing one or more of three key features that drive viral videos: whimsical feel good spots that provide an escape, content that raises questions such as “is it real?” and deep musical connection.

Check out the full list and watch the videos at Ad Age {link no longer active}.