Students who buy a Mac (which includes the MacBook, MacBook Pro, MacBook Air and iMac) will get a free iPod touch or iPod nano. My advice: go with the MacBook+iPod touch combo. You can’t bring an iMac to class, and an iPod touch can do so much more than a nano.
Keep in mind that you’re actually getting a $299 rebate and not an iPod touch or nano, but the idea is that you’ll use the rebate to buy an iPod.
Like it says, enjoy your time at school.