Rake and Albacore support
Very efficient way of building projects and doing interesting tasks. Check the rakefile.rb in the build setup of FubuMVC :)
Whats the status on this? We have been using rake in our build process to run our fluent migrations! This would really be handy : )
Could definitely do with this being supported in AppHarbor, this is how we've been building all of our projects for the last 2 years or so and it's very easy to set up and maintain.