

Wi-Fi is a trademark of the Wi-Fi Alliance for certified products based on the IEEE 802.11 standards. This certification warrants interoperability between different wireless devices.
Wi-Fi is often used for wireless internet (WLAN ), but actually every product does not have the Wi-Fi certification and hence not all WLAN's are Wi-Fi.
Wi-Fi is supported by most personal computer operating systems, many game consoles, laptops, smartphones, printers, and other peripherals.
Through interconnected access points (hotspots) Wi-Fi can lead to connectivity over large square miles of area, though a typical Wi-Fi home router has a range of 32 m indoors and 95 m outdoors.

Bluetooth is intended for non resident equipment and its applications. The category of applications is outlined as the wireless personal area network (WPAN). Bluetooth is a replacement for cabling in a variety of personally carried applications.
Bluetooth has a range of less than 10m for gadegts we use (class II device), but it can go upto 100m (class I device). The current version of Bluetooth is 2.1
Next version Bluetooth 3.0 (codename Seattle ) is expected to be released this year which will allow use of Bluetooth over UltraWideBand ( UWB) radio, and data transfer upto 480 Mbit/s.
I guess it's enough for the day. Now we can keep an eye on the future developments in Wireless Connectivity in a more informed way !!