Amazon RDS replication with external slave
For RDS to have binlogs, there are a couple non-obvious tricks.  First, you need to set the "backup retention period" to at least 1 day.  This turns on binlogging.  

Then, in order to prevent a ridiculous rollover rate in the logs:

call mysql.rds_set_configuration('binlog retention hours', 24);


Here's some documentation that Amazon provides for dumping the database and starting up the replication:  http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MySQL.Procedural.Exporting.NonRDSRepl.html