Because i'm in a particularly pedantic mood: I don't think ELB (Amazon's load balancing) is free, which is a little misleading.

In fact:

* $0.025 per Elastic Load Balancer-hour (or partial hour)

* $0.008 per GB of data processed by an Elastic Load Balancer

Source: http://aws.amazon.com/ec2/pricing/

Obviously these are problems loads of people face / hope to face, so it would have been nice to get some more 'meat' in this post.

Edit: formatting