I'm on a PC right now and the fan is whirring at full speed. My next computer will be the MBP when the line is updated. I've had a lot of problems with my current laptop as far as heat and fan noise. When does your fan kick in? Does it start whirring away when you open Safari? Also, how hot does it get under normal tasks like emailing and browsing the web? Do you recommend using any fan software to keep things under better control? Thanks.