Sitecore 8, Octopack, .Sitecore.Speak.Important.config not included.
If you use octopus deploy you may find it doesn't add /App_Config/Include/.Sitecore.Speak.Important.config to the nuget package.
To resolve simply add /p:OctoPackNuGetArguments=-NoDefaultExcludes to your MSBUILD step.
Without .Sitecore.Speak.Important.config SPEAK won't work (your will get an error in the console that /-/speak/v1/assets/main.js does not exist).
So yup, it is important!