I've been using the retina MBP 15" heavily since its release. I noticed the fan for the first time last week when I was booted into Windows. There are other is

I've been using the retina MBP 15" heavily since its release. I noticed the fan for the first time last week when I was booted into Windows. There are other issues with the machine—notably the screen flicker and ghosting that others have had issues with—but I wouldn't worry about this.