SPEAKING FREELYToday anti-Japan, tomorrow anti-Beijing?By Aaron Kyle Dennis Speaking Freely is an Asia Times Online feature that allows guest writers to have their say. Please click here if you are interested in contributing. SHANGHAI - What's at stake when 20,000 people in Shanghai take to the streets? On Saturday, April 16, at about 9:30 in the morning, throngs of Chinese took to the streets around Shanghai's People's Square. Armed with eggs, bottles, stones and a long-standing anti-Japanese nationalist sentiment, these angry patriots flowed like a river through 16 kilometers of the city, merging like flooded tributaries into a raging torrent of...