I just set Ghost up last night via the Digital Ocean droplet. The site is up, but I'm having difficulties during the sign up/subscribe process. Set up mailgun, edited the config file with credentials, but the problem persists. Hoping to get it solved this weekend when I have more time to look into it; but I definitely agree, Ghost is awesome!

Update: Got it working. Apparently Digital Ocean has some SMTP ports blocked by default. I must say, Ghost is incredible! It's built with one of my all-time favorite templating engines (handlebars) as well, so setting up custom themes would be a breeze.