20 hours of video are uploaded to YouTube each minute

"In mid-2007, six hours of video were uploaded to YouTube every minute. Then it grew to eight hours per minute, then 10, then 13. In January of this year, it became 15 hours of video uploaded every minute, the equivalent of Hollywood releasing over 86,000 new full-length movies into theaters each week.
Now, 20 hours of video are uploaded to YouTube every minute, and it is a testament to the fact that you've made YouTube your online video home."
Source: YouTube blog, 20th May 2009
In September 2008 the number was stated at 13 hours per minute