A while back (and on the AWSUG website still) I read about Daniel Sikar’s talk “Running Memcached clusters on Amazon EC2″ 18:30 on 4th November 2010 at SkillsMatter at the time the link didn't work so I couldn't sign up, and forgot to check back later, I'm not sure if the event went ahead?
Anyway it looks like it is being run (again) on Wednesday 1st December...
http://skillsmatter.com/event/cloud-grid/running-memcached-clusters-on-amazon-ec2-842
Cheers
Paul