If you're a BlackBerry developer you may be interested in knowing that Research In Motion officially launched the Wi-Fi geolocation service a little over a week ago. Using Wi-Fi Access Point data that has been collected anonymously from your BlackBerry, this technology can provide location based sharing apps (such as foursquare or Twitter) a quick and accurate location fix.
Wi-Fi geolocation is faster and more convenient than GPS-based and Cell-site based location as well as uses less bandwidth, though the accuracy falls somewhere between that of GPS and Cell-site. APIs are available for devices running BlackBerry 6 OS and and higher, though service provisioning may take up to 3 more weeks. For complete details, head on over to the source link below. Thanks for sending this in Ray!
Source: BlackBerry Developer's Blog