Ad Age 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.

This week s chart reflects the battles being played out between Apple and Microsoft over computers, and Apple and Verizon over smart phones.  The viral video winner for now is Apple, with their Windows 7 bashing Mac ad pulling in nearly 1.7 million views to make number two on the list.  Verizon, which had its own Apple-bashing There’s a Map for That ads on the chart before, sees its TV spot for the Droid phone make number four on the chart with more than 960,000 views.  For Microsoft, a Windows 7 spot breaks into the top ten, and Project Natal remains a fixture on the chart.  This week it’s at number six with more than 400,000 views.

Number one for the week is a video of Volkswagen’s street art experiment with an environmental message, where the carmaker turned a subway staircase into a foot piano.  Vodafone’s Symphonia spot creating classical music out of mobile ring-tones breaks into the list at number 10.

Check out the full list and watch the videos at Ad Age {link no longer active}.