Auto generate Alter table SQL:
http://serverfault.com/questions/65043/alter-charset-and-collation-in-all-columns-in-all-tables-in-mysql
MySQL doc in Alter table SQL
http://dev.mysql.com/doc/refman/5.1/en/alter-table.html
Step By Step from latin to utf8 conversion (中文)
http://www.dk101.com/Discuz/viewthread.php?tid=161541
mysqldump conversion (linux)
http://blogs.law.harvard.edu/djcp/2010/01/convert-mysql-database-from-latin1-to-utf8-the-right-way/