Burnlab loves GOOD Magazine because it takes on important issues in a smart, fun, and engaging way - without all the venom and vinegar of publications like Adbusters. I especially love GOOD's 21st century take on after-school public service announcements.
A few faves that tickle the brain:

Nuclear Weapons
E-Waste
Paying For Your Attention
Bruce Sterling on Climate Change
and everyone's favorite, Internet Porn