I lose a ton of productivity by getting distracted while waiting for my tests to run. Usually, I'll start to look at something while they're loading --- and 15-20 minutes later I realize my tests are long done, and I've spent 10 minutes reading online.Make a small change... rerun tests ... another 10-15 minutes wasted!How can I make my computer make some kind of alert (Sound or growl notification) when my tests finish, so I can snap back to what I was doing?? 
Make audible Ding! sound, or growl notification, when `rake test` finishes!
productivity
While I haven't tried this, a quick Google search brought up growlnotify, which will send growl notifications from the command line.From there, it's just something like this:$ rake test ; growlnotify doneYour syntax may vary.