Glenn Fleishman has put to byte some thoughts about Bluetooth and (not Versus) Wi-Fi. It's one of the better short-and-to-the-point explanations of the two technologies, explaining why they can co-exist. If you need to explain to someone why you would use either, this is a good starting point.
"Bluetooth proponents picture a world of roaming devices and people.... Wi-Fi backers break the world into zones at home, work, and on the road, that offer access to larger networks."
"Distilled: Wi-Fi solves bandwidth-heavy, network-based (whether intranet or Internet) connectivity; Bluetooth offers ad hoc, resource-based opportunistic availability."
8:55:29 PM 
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