In MySQL system variable lower_case_table_names controls if identifiers are case sensitive. The default setting is 0 if the OS file system is case sensitive, if not 1 - there some exceptions when it comes to Mac OS. However the documentation recommends lower_case_table_names = 1 when using the InnoDB engine.
"Exception: If you are using InnoDB tables, you should set lower_case_table_names to 1 on all platforms to force names to be converted to lower case."
UPDATE: As it is on 15/06/2010 this parameter cannot be changed on Amazon RDS instances. It is set to lower_case_table_names=0 it would seem.