Market Mania In China Stocks remain a wild gamble, but millions of unsophisticated investors are rushing in <A HREF="http://www.businessweek.com/globalbiz/content/mar2007/gb20070308_895782.htm?chan=top+news_top+news+index_businessweek+exclusives" target="_blank">http://www.businessweek.com/globalbiz/content/mar2007/gb20070308_895782.htm?chan=top+news_top+news+i...</A>