OpenX was invited to present as part of the AWS Start-Up Tour 2009, which stopped in Los Angeles on June 15th. John Linden, our CTO, gave a presentation on the ways we use EC2 here at OpenX. He got a lot of questions, which means people were awake and alert ;-)
Until John's slides are posted to Slideshare, here are 2 other presentations, one from eHarmony on the way they use Elastic MapReduce, and one from Amazon's own Jinesh Varia on 'Architecting for the AWS cloud'. Interesting stuff. Check out this Slideshare page for more links to other AWS-related presentations.