Interesting to me was noting that:
they just got around to this 8 months ago, and they're fscking Facebook (which means you can wait)
they're still doing all writes to a single datacenter
they're hacking an object-level mark/sweep into the MySQL replication stream suggesting a certain parable of a hammer and nails.
Lol. Takeaway #3 is my favorite.
Regarding the other two takeaways, I think Moore's Law will ensure the simplicity of single-datacenter and/or onsite deployments will be a compelling alternative to the clouds for quite some time.
In other words, use Google App Engine et al if you like the cost and API's. For the distributed scalability, YNGNI.