MySQL Replication...Important Links

http://dba.stackexchange.com/questions/20601/what-are-the-limits-on-the-amount-of-slaves-per-master
http://dba.stackexchange.com/questions/4311/is-mysql-replication-affected-by-a-high-latency-interconnect/4390#4390
http://dev.mysql.com/doc/refman/5.5/en/replication-semisync.html
http://dba.stackexchange.com/questions/9424/best-way-to-setup-master-to-multi-master-replication/9425#9425