In my System Preferences on my MBP early 2011, I notice there's a new item under "Other" column called "Growl." What is this and how did it get there? I could have sworn I didn't see that there before when I first started using my MBP. My MBP is merely a couple of weeks old. I'm reading it's a notification system... but I don't recall installing anything of the sort. Has anyone else seen this item appear?