I'm sure a lot of you got the email DO sent out yesterday but I figured I'd share for anyone who doesn't since this is pretty cool and something that relatively few providers offer at this price point:
Introducing Private Networking
You've requested it, and now it's here! DigitalOcean is happy to announce that all droplets in NYC2 are now equipped with Shared Private Networking, allowing them to communicate with other droplets in that same datacenter. You can enable shared private networking on your Droplet from the Droplet create screen.
Traffic sent between Droplets across the private network will not count towards the bandwidth costs and can be used for database replication, file storage, and similar host to host communication. Check out our full length tutorial on how to set-up and use Shared Private Networking.