During the RC release, we published a custom provider that will help you sync MySql databases. The limitaions of the provider was syncing from archive/package and syncing over the agent, since DeploymentObject.GetStream() method was not public in that
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Read the complete post at http://blogs.iis.net/msdeploy/archive/2009/04/29/changes-to-the-custom-provider-for-mysql-dbfullmysql.aspx