Hi Andreas,
Could you please clarify your requirements for replication? Do you need a bi-directional, synchonized replication? Hope not :) Or you probably just need to transfer data to MySQL daily.
DataPropagator can work with non-IBM databases, but it requires support for triggers since it uses them to catch updates.
MySQL offers a great feature in the LOAD DATA INFILE command - REPLACE option.
You can export data from DB2 and load only new/modified records to MySQL using this option.
But first please tell us your requirements.
Best regards, Dmitry Tolpeko
SQLWays - Data, Schema transfer tool for Oracle, DB2, SQL Server, Sybase, Informix and MySQL
http://www.ispirer.com