Do you recognize this situation? You run a rake task (for example, rake spec), which you know it’s going to take some time (e.g. 3 or 4 minutes). You say “Great moment to check what’s going on on Twitter”. 10 minutes and 3 tabs with blog posts later, you realize you were actually waiting for a task to finish, a task which finished long before. Bye, bye, productivity!! rakegrowl tells you when your rake tasks end via Growl.