Sensible, clear advice on protecting your Wi-Fi network's in-transit data in The New York Times (free reg. required): Frequent readers of this site know that we take mainstream media to task--even publications that we occasionally write for--when they get the story wrong and focus on the wrong advice or lazily fail to interview people who know what's going on. So let's praise correctness, too.
This piece by Sean Captain about securing Wi-Fi networks is a model of clarity and accuracy, covering all of the major points about encryption using WEP, WPA, 802.1X (without using that wonky standards number, even), and VPNs--all while avoiding jargon and too much detail. It's enough to be useful without overwhelming.
Sean is an editor at PC World the last time I checked, and he was responsible for a large package of stories evaluating 802.11g routers that ran last fall. It, too, was an incredible effort that distilled lots of useful wisdom and practical testing into a solid package.