Very little coverage of this story in the US Media.

Link to YouTube clip of a story CTV ran on the banner unfurling

From CBC article

Three Canadians arrested by Chinese police following a protest at the Great Wall against China's presence in Tibet have been released.

The British Columbian activists — Lhadon Tethong, Sam Price and Melanie Raoul — left China after their release on Wednesday and flew into Hong Kong.

Lhadon Tethong, the driving force behind this protest, has generated a lot of online buzz through the smart use of internet technologies, blogging, live video etc. 

See also:

Technology for Tibet Trumps Tyranny!

Tech-savvy pro-Tibet protesters get message across

From London to Lhasa Students for a Free Tibet UK blog their stories, thoughts, and actions.