Rogue Access Point Detection?

Yossarian2000 asks: "With all the media attention WLANs have been getting lately, more and more businesses seem to be looking to better understand their implications as relates to company intranets. Whether a business is running a WLAN or not, detecting rogue access points is essential to maintaining some degree of security. Currently, it seems there are few options for detecting APs: subnet scans (which add overhead to the network and can still miss some APs), handheld devices (which require regular site surveys), and systems that use existing access points to detect rogues (this assumes you have APs covering your entire site). Has anyone heard of better methods for the detection of rogue APs?"