As long-time readers know, I love MIT's Technology Review. Published 6 times a year, it's my bimonthly dose of geek awesomeness.
I particularly love their annual 35 top innovators under 35 issue, which just arrived recently. They cover the Web, communications, materials (actual hard science), biomedicine, energy and computing and give us a preview of the thinking and inventions that will change our world in the coming years. Definitely check it out.