With the newer Intel Macs, I'm told you can run Windows applications, too. I don't know what excuse anyone has not to abandon the dark side any more.
They've got a special deal going on right now for the college-bound. If you buy a new Mac for your child who's heading off to college (perhaps the lovely Mac mini shown below) and buy the iPod nano, you get a rebate for the cost of the iPod. It's a perfect synergy: you'd be helping to fund the blog that your student can read on her new computer to get more excited about biology.
It's a win/win.