Not the original poster, but here's some stuff I really wish AWS had:

a) Ability to map an elastic IP to an ELB. The CNAME thing it uses now has way too many drawbacks [1].

b) Ability to make an RDS instance a slave to or a master for a normal MySQL instance. This would make it possible to use RDS as a backup to our ordinary DB infrastructure using normal MySQL replication (and eventually, vice versa)

c) Retention periods for EBS snapshots. You can get this yourself by writing a few simple scripts, but it would be really nice if snapshots could simply be labelled "delete after 90 days".

d) A cross-availability zone, synchronously replicated EBS volume. This is probably fairly specific to our use case, but it would be neat if AWS natively provided something like DRBD.

[1] http://blog.pagerduty.com/2010/08/31/load-balancers-need-sta...

It's not me in particular, but if you read the EC2 forum going back to 2006 people have been asking for full virtualization, multiple IPs, multicast, non-NAT, reverse ARP, shared EBS, etc.

Disk I/O performance that doesn't suck.

Let us add dev pay instances to an ELB.

More ram.

Elastic private ip addresses.

Change security groups of running instances.

I have a lot more, but those are my big ones.

While it is true that you cannot add new ones or remove existing ones, you can modify an existing security group of a running instance: http://aws.amazon.com/articles/1145?_encoding=UTF8&jiveR....

Do you work with AWS?