Few facts about AWS Auto Scaling.

A single Group can launch only same type of EC2 instance.
A single Group can launch only one type of AMI
AMI's need to be present in the same region, rather same zone
We can not used this group to scale RDS instance
If we keep ELB as one level higher than Auto Scaling Group, when Scale Down happens, the process instructs ELB to remove EC2 instance from ELB group first.
Should be cautious about using Elastic IP with Auto Scaling Group. It may not be a cost effective option.
Max # of Launch configuration per AWS account is 100.

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