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Wifi aka 802.11 (a, b, g, or n) is a wireless technology for connecting devices to a network. In other words, you can connect your PDA to a another computer or wireless network without using ethernet cables. Typical distance is about 100m or so, barring obstructions and interference. WiMax is a development of this technology that covers much greater distances.
Bluetooth is another wireless technology you may have heard of, which is much shorter range, and is generally treated as a cable replacement technology. Some of the devices you can connect (wirelessly) include headsets/stereo headphones, keyboards, mouse, GPS, and gamepads. General range is about 10m and most PDAs have bluetooth as well (including all the PDA phones).
It'd help if you can tell me where you're located - there's quite a few humdingers that aren't available in the States, and I wouldn't want to recommend something that you can't get.
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"A planner is a gentle man, with neither sword nor pistol.
He walks along most daintily, because his balls are crystal."
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